pen name

noun

pseudonym adopted by an author (or a group of authors) and printed on the title page in place of their real name

A fictitious name used by an author in place of their actual name; a writer's pseudonym.
“Within a week of King's acknowledging the Bachman pen name, several sources —publishers, book dealers, readers, and fans—had mentioned a number of possible other pseudonyms; obviously, if King admitted to two pen names, John Swithen and Richard Bachmann, there might be others.”
“In their time, it was fashionable to sign letters using a pen name. These pen names were borrowed from characters in classical literature.”