A pseudonym is a fake or made-up name that someone uses in place of their real name to keep their identity anonymous or to create a new identity. Full definition
Back in Hollywood thereafter — the movie elides the two years he spent in Mexico with three other screenwriters and their families — he's obliged to support his family by writing screenplays under pseudonyms for low - rent producers such as the King brothers (played for laughs by John Goodman and Stephen Root). (rogerebert.com)
Authors have been using pseudonyms for as long as they've been writing. (russellblake.com)
No hiding behind the safety of the anonymity of pseudonyms for you guys! (remonline.com)