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Fictitious name assumed for a particular purpose

A pseudonym ('/sj//uː//d//ə//n//ɪ//m/; ) or alias ('/eɪ//l//i//.//ə//s/) is a fictitious name that a person assumes for a particular purpose, which differs from their original or true name (orthonym). This also differs from a new name that entirely or legally replaces an individual's own. Many pseudonym holders use them because they wish to remain anonymous, but anonymity is difficult to achieve and often fraught with legal issues.

Pseudonyms include stage names, user names, ring names, pen names, aliases, superhero or villain identities and code names, gamer identifications, and regnal names of emperors, popes, and other monarchs. In some cases, it may also include nicknames. Historically, they have sometimes taken the form of anagrams, Graecisms, and Latinisations. Pseudonyms should not be confused with new names that replace old ones and become the individual's full time name. Pseudonyms are "part time" names, used only in certain contexts: to provide a more clear cut separation between one's private and professional lives, to showcase or enhance a particular persona, or to hide an individual's real identity, as with writers' pen names, graffiti artists' tags, resistance fighters' or terrorists' noms de guerre, computer hackers' handles, and other online identities for services such as social media, online gaming, and internet forums. Actors, musicians, and other performers sometimes use stage names for a degree of privacy, to better market themselves, and other reasons. In some cases, pseudonyms are adopted because they are part of a cultural or organisational tradition; for example, devotional names are used by members of some religious institutes, and "cadre names" are used by Communist party leaders such as Trotsky and Lenin. A collective name or collective pseudonym is one shared by two or more persons, for example, the co authors of a work, such as Carolyn Keene, Erin Hunter, Ellery Queen, Nicolas Bourbaki, or James S. A. Corey.

The term pseudonym is derived from the Greek word "ψευδώνυμον" (pseudṓnymon), literally "false name", from ψεῦδος (pseûdos) 'lie, falsehood' and ὄνομα (ónoma) "name". The term alias is a Latin adverb meaning "at another time, elsewhere".

Sometimes people change their names in such a manner that the new name becomes permanent and is used by all who know the person. This is not an alias or pseudonym, but in fact a new name. In many countries, including common law countries, a name change can be ratified by a court and become a person's new legal name.

Pseudonymous authors may still have their various identities linked together through stylometric analysis of their writing style. The precise degree of this unmasking ability and its ultimate potential is uncertain, but the privacy risks are expected to grow with improved analytic techniques and text corpora. Authors may practice adversarial stylometry to resist such identification.

Businesspersons of ethnic minorities in some parts of the world are sometimes advised by an employer to use a pseudonym that is common or acceptable in that area when conducting business, to overcome racial or religious bias.

Criminals may use aliases, fictitious business names, and dummy corporations (corporate shells) to hide their identity, or to impersonate other persons or entities in order to commit fraud. Aliases and fictitious business names used for dummy corporations may become so complex that, in the words of The Washington Post, "getting to the truth requires a walk down a bizarre labyrinth" and multiple government agencies may become involved to uncover the truth. Giving a false name to a law enforcement officer is a crime in many jurisdictions; see identity fraud.

Pseudonyms and acronyms are often employed in medical research to protect subjects' identities through a process known as de identification.

Nicolaus Copernicus put forward his theory of heliocentrism in the manuscript Commentariolus anonymously, in part because of his employment as a law clerk for a church government organization. Sophie Germain and William Sealy Gosset used pseudonyms to publish their work in the field of mathematics – Germain, to avoid rampant 19th century academic misogyny, and Gosset, to avoid revealing brewing practices of his employer, the Guinness Brewery. Satoshi Nakamoto is a pseudonym of a still unknown author or authors' group behind a white paper about bitcoin.

In Ancien Régime France, a nom de guerre ("war name") would be adopted by each new recruit (or assigned to them by the captain of their company) as they enlisted in the French army. These pseudonyms had an official character and were the predecessor of identification numbers: soldiers were identified by their first names, their family names, and their noms de guerre (e. g. Jean Amarault dit Lafidélité). These pseudonyms were usually related to the soldier's place of origin (e. g. Jean Deslandes dit Champigny, for a soldier coming from a town named Champigny), or to a particular physical or personal trait (e. g. Antoine Bonnet dit Prettaboire, for a soldier prêt à boire, ready to drink). In 1716, a nom de guerre was mandatory for every soldier; officers did not adopt noms de guerre as they considered them derogatory. In daily life, these aliases could replace the real family name. Noms de guerre were adopted for security reasons by members of World War II French resistance and Polish resistance. Such pseudonyms are often adopted by military special forces soldiers, such as members of the SAS and similar units of resistance fighters, terrorists, and guerrillas. This practice hides their identities and may protect their families from reprisals; it may also be a form of dissociation from domestic life. Some well known men who adopted noms de guerre include Carlos, for Ilich Ramírez Sánchez; Willy Brandt, Chancellor of West Germany; and Subcomandante Marcos, spokesman of the Zapatista Army of National Liberation (EZLN). During Lehi's underground fight against the British in Mandatory Palestine, the organization's commander Yitzchak Shamir (later Prime Minister of Israel) adopted the nom de guerre "Michael", in honour of Ireland's Michael Collins. Pseudonym was also stylized as suedonim in a common misspelling of the original word so as to preserve the price of telegrams in World War I and II. Revolutionaries and resistance leaders, such as Lenin, Stalin, Trotsky, Golda Meir, Philippe Leclerc de Hauteclocque, and Josip Broz Tito, often adopted their noms de guerre as their proper names after the struggle. George Grivas, the Greek Cypriot EOKA militant, adopted the nom de guerre Digenis (Διγενής). In the French Foreign Legion, recruits can adopt a pseudonym to break with their past lives. Mercenaries have long used "noms de guerre", sometimes even multiple identities, depending on the country, conflict, and circumstance. Some of the most familiar noms de guerre today are the kunya used by Islamic mujahideen. These take the form of a teknonym, either literal or figurative. Such war names have also been used in Africa. Part of the molding of child soldiers has included giving them such names. They were also used by fighters in the People's Liberation Army of Namibia, with some fighters retaining these names as their permanent names.

Individuals using a computer online may adopt or be required to use a form of pseudonym known as a "handle" (a term deriving from CB slang), "user name", "login name", "avatar", or, sometimes, "screen name", "gamertag", "IGN (In Game (Nick)Name)" or "nickname". On the Internet, pseudonymous remailers use cryptography that achieves persistent pseudonymity, so that two way communication can be achieved, and reputations can be established, without linking physical identities to their respective pseudonyms. Aliasing is the use of multiple names for the same data location. More sophisticated cryptographic systems, such as anonymous digital credentials, enable users to communicate pseudonymously (i. e., by identifying themselves by means of pseudonyms). In well defined abuse cases, a designated authority may be able to revoke the pseudonyms and reveal the individuals' real identity. Use of pseudonyms is common among professional eSports players, despite the fact that many professional games are played on LAN. Pseudonymity has become an important phenomenon on the Internet and other computer networks. In computer networks, pseudonyms possess varying degrees of anonymity, ranging from highly linkable public pseudonyms (the link between the pseudonym and a human being is publicly known or easy to discover), potentially linkable non public pseudonyms (the link is known to system operators but is not publicly disclosed), and unlinkable pseudonyms (the link is not known to system operators and cannot be determined). For example, true anonymous remailer enables Internet users to establish unlinkable pseudonyms; those that employ non public pseudonyms (such as the now defunct Penet remailer) are called pseudonymous remailers. The continuum of unlinkability can also be seen, in part, on Wikipedia. Some registered users make no attempt to disguise their real identities (for example, by placing their real name on their user page). The pseudonym of unregistered users is their IP address, which can, in many cases, easily be linked to them. Other registered users prefer to remain anonymous, and do not disclose identifying information. However, in certain cases, permits system administrators to consult the server logs to determine the IP address, and perhaps the true name, of a registered user. It is possible, in theory, to create an unlinkable Wikipedia pseudonym by using an Open proxy, a Web server that disguises the user's IP address. But most open proxy addresses are blocked indefinitely due to their frequent use by vandals. Additionally, Wikipedia's public record of a user's interest areas, writing style, and argumentative positions may still establish an identifiable pattern. System operators (sysops) at sites offering pseudonymity, such as Wikipedia, are not likely to build unlinkability into their systems, as this would render them unable to obtain information about abusive users quickly enough to stop vandalism and other undesirable behaviors. Law enforcement personnel, fearing an avalanche of illegal behavior, are equally unenthusiastic. Still, some users and privacy activists like the American Civil Liberties Union believe that Internet users deserve stronger pseudonymity so that they can protect themselves against identity theft, illegal government surveillance, stalking, and other unwelcome consequences of Internet use (including unintentional disclosures of their personal information and doxing, as discussed in the next section). Their views are supported by laws in some nations (such as Canada) that guarantee citizens a right to speak using a pseudonym. This right does not, however, give citizens the right to demand publication of pseudonymous speech on equipment they do not own.

Most Web sites that offer pseudonymity retain information about users. These sites are often susceptible to unauthorized intrusions into their non public database systems. For example, in 2000, a Welsh teenager obtained information about more than 26,000 credit card accounts, including that of Bill Gates. In 2003, VISA and MasterCard announced that intruders obtained information about 5.6 million credit cards. Sites that offer pseudonymity are also vulnerable to confidentiality breaches. In a study of a Web dating service and a pseudonymous remailer, University of Cambridge researchers discovered that the systems used by these Web sites to protect user data could be easily compromised, even if the pseudonymous channel is protected by strong encryption. Typically, the protected pseudonymous channel exists within a broader framework in which multiple vulnerabilities exist. Pseudonym users should bear in mind that, given the current state of Web security engineering, their true names may be revealed at any time.

Pseudonymity is an important component of the reputation systems found in online auction services (such as eBay), discussion sites (such as Slashdot), and collaborative knowledge development sites (such as Wikipedia). A pseudonymous user who has acquired a favorable reputation gains the trust of other users. When users believe that they will be rewarded by acquiring a favorable reputation, they are more likely to behave in accordance with the site's policies. If users can obtain new pseudonymous identities freely or at a very low cost, reputation based systems are vulnerable to whitewashing attacks, also called serial pseudonymity, in which abusive users continuously discard their old identities and acquire new ones in order to escape the consequences of their behavior: "On the Internet, nobody knows that yesterday you were a dog, and therefore should be in the doghouse today." Users of Internet communities who have been banned only to return with new identities are called sock puppets. Whitewashing is one specific form of Sybil attack on distributed systems. The social cost of cheaply discarded pseudonyms is that experienced users lose confidence in new users, and may subject new users to abuse until they establish a good reputation. In contrast, research by the blog comment hosting service Disqus found pseudonymous users contributed the "highest quantity and quality of comments", where "quality" is based on an aggregate of likes, replies, flags, spam reports, and comment deletions,
[[File:HuffPo comments reason words insults. svg|thumb|Comment types used on HuffPost using different kinds of anonymity Proposals have been made to raise the costs of obtaining new identities, such as by charging a small fee or requiring e mail confirmation. Academic research has proposed cryptographic methods to pseudonymize social media identities or government issued identities, to accrue and use anonymous reputation in online forums, or to obtain one per person and hence less readily discardable pseudonyms periodically at physical world pseudonym parties. Others point out that Wikipedia's success is attributable in large measure to its nearly non existent initial participation costs.

People seeking privacy often use pseudonyms to make appointments and reservations. Those writing to advice columns in newspapers and magazines may use pseudonyms. Steve Wozniak used a pseudonym when attending the University of California, Berkeley after co founding Apple Computer, because "[he] knew [he] wouldn't have time enough to be an A+ student."

When used by an actor, musician, radio disc jockey, model, or other performer or "show business" personality a pseudonym is called a stage name, or, occasionally, a professional name, or screen name.

Members of a marginalized ethnic or religious group have often adopted stage names, typically changing their surname or entire name to mask their original background. Stage names are also used to create a more marketable name, as in the case of Creighton Tull Chaney, who adopted the pseudonym Lon Chaney Jr., a reference to his famous father Lon Chaney Sr.

Chris Curtis of Deep Purple fame was christened as Christopher Crummey ("crummy" is UK slang for poor quality). In this and similar cases a stage name is adopted simply to avoid an unfortunate pun. Pseudonyms are also used to comply with the rules of performing arts guilds (Screen Actors Guild (SAG), Writers Guild of America, East (WGA), AFTRA, etc. ), which do not allow performers to use an existing name, in order to avoid confusion. For example, these rules required film and television actor Michael Fox to add a middle initial and become Michael J. Fox, to avoid being confused with another actor named Michael Fox. This was also true of author and actress Fannie Flagg, who shared her real name, Patricia Neal, with another well known actress; Rick Copp, who chose the pseudonym name Richard Hollis, which is also the name of a character in the anthology TV series Femme Fatales; and British actor Stewart Granger, whose real name was James Stewart. The film making team of Joel and Ethan Coen, for instance, share credit for editing under the alias Roderick Jaynes. Some stage names are used to conceal a person's identity, such as the pseudonym Alan Smithee, which was used by directors in the Directors Guild of America (DGA) to remove their name from a film they feel was edited or modified beyond their artistic satisfaction. In theatre, the pseudonyms George or Georgina Spelvin, and Walter Plinge are used to hide the identity of a performer, usually when he or she is "doubling" (playing more than one role in the same play). David Agnew was a name used by the BBC to conceal the identity of a scriptwriter, such as for the Doctor Who serial City of Death, which had three writers, including Douglas Adams, who was at the time of writing the show's Script Editor. In another Doctor Who serial, The Brain of Morbius, writer Terrance Dicks demanded the removal of his name from the credits saying it could go out under a "bland pseudonym".

Musicians and singers can use pseudonyms to allow artists to collaborate with artists on other labels while avoiding the need to gain permission from their own labels, such as the artist Jerry Samuels, who made songs under Napoleon XIV. Rock singer guitarist George Harrison, for example, played guitar on Cream's song "Badge" using a pseudonym. In classical music, some record companies issued recordings under a nom de disque in the 1950s and 1960s to avoid paying royalties. A number of popular budget LPs of piano music were released under the pseudonym Paul Procopolis. Another example is that Paul McCartney used his fictional name "Bernerd Webb" for Peter and Gordon's song Woman. Pseudonyms are used as stage names in heavy metal bands, such as Tracii Guns in LA Guns, Axl Rose and Slash in Guns N' Roses, Mick Mars in Mötley Crüe, Dimebag Darrell in Pantera, or C. C. Deville in Poison. Some such names have additional meanings, like that of Brian Hugh Warner, more commonly known as Marilyn Manson: Marilyn coming from Marilyn Monroe and Manson from convicted serial killer Charles Manson. Jacoby Shaddix of Papa Roach went under the name "Coby Dick" during the Infest era. He changed back to his birth name when lovehatetragedy was released. David Johansen, front man for the hard rock band New York Dolls, recorded and performed pop and lounge music under the pseudonym Buster Poindexter in the late 1980s and early 1990s. The music video for Poindexter's debut single, Hot Hot Hot, opens with a monologue from Johansen where he notes his time with the New York Dolls and explains his desire to create more sophisticated music. Ross Bagdasarian Sr., creator of Alvin and the Chipmunks, wrote original songs, arranged, and produced the records under his real name, but performed on them as David Seville. He also wrote songs as Skipper Adams. Danish pop pianist Bent Fabric, whose full name is Bent Fabricius Bjerre, wrote his biggest instrumental hit "Alley Cat" as Frank Bjorn. For a time, the musician Prince used an unpronounceable "Love Symbol" as a pseudonym ("Prince" is his actual first name rather than a stage name). He wrote the song "Sugar Walls" for Sheena Easton as "Alexander Nevermind" and "Manic Monday" for the Bangles as "Christopher Tracy". (He also produced albums early in his career as "Jamie Starr"). Many Italian American singers have used stage names, as their birth names were difficult to pronounce or considered too ethnic for American tastes. Singers changing their names included Dean Martin (born Dino Paul Crocetti), Connie Francis (born Concetta Franconero), Frankie Valli (born Francesco Castelluccio), Tony Bennett (born Anthony Benedetto), and Lady Gaga (born Stefani Germanotta)

In 2009, the British rock band Feeder briefly changed their name to Renegades so they could play a whole show featuring a set list in which 95 per cent of the songs played were from their forthcoming new album of the same name, with none of their singles included. Front man Grant Nicholas felt that if they played as Feeder, there would be uproar over his not playing any of the singles, so used the pseudonym as a hint. A series of small shows were played in 2010, at 250 to 1,000 capacity venues with the plan not to say who the band really are and just announce the shows as if they were a new band. In many cases, hip hop and rap artists prefer to use pseudonyms that represents some variation of their name, personality, or interests. Examples include Iggy Azalea (her stage name is a combination of her dog's name, Iggy, and her home street in Mullumbimby, Azalea Street), Ol' Dirty Bastard (known under at least six aliases), Diddy (previously known at various times as Puffy, P. Diddy, and Puff Daddy), Ludacris, Flo Rida (whose stage name is a tribute to his home state, Florida), British Jamaican hip hop artist Stefflon Don (real name Stephanie Victoria Allen), LL Cool J, and Chingy. Black metal artists also adopt pseudonyms, usually symbolizing dark values, such as Nocturno Culto, Gaahl, Abbath, and Silenoz. In punk and hardcore punk, singers and band members often replace real names with tougher sounding stage names such as Sid Vicious of the late 1970s band Sex Pistols and "Rat" of the early 1980s band The Varukers and the 2000s re formation of Discharge. The punk rock band The Ramones had every member take the last name of Ramone. Henry John Deutschendorf Jr., an American singer songwriter, used the stage name John Denver. The Australian country musician born Robert Lane changed his name to Tex Morton. Reginald Kenneth Dwight legally changed his name in 1972 to Elton John.