A pseudonym or allonym is a name, (sometimes legally adopted, sometimes purely fictitious), used by an individual as an alternative to their birth name.
When used by authors, a pseudonym is also called a pen name or (in French) nom de plume. This is an English expression: in France, such an alias is more commonly termed a nom de guerre, or "name of war".
When used by actors, performers, or models, a pseudonym is also called a stage name (or sometimes "screen name")
Famous pseudonyms of people who were neither authors nor actors include:
See also: