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Longman Dictionary of Contemporary English
stage name
noun
EXAMPLES FROM CORPUS
▪ Alice entered the competition in London under a stage name Lavender Lee.
▪ Born Alice Nilsson, Babs adopted her stage name as a teenage star in radio, records and film.
▪ His companion chuckled at the jest, but Gravelet, whose stage name was Blondin, was deadly serious.
▪ In Ross v Hopkinson, an actress sued the publisher of a novel in which a character bore her stage name.
▪ Known only be a stage name, he is pure role.
▪ Louis Maddox: but his stage name was Orso.
▪ She began acting in her childhood under the stage name Marjorie Moore.
Wiktionary
stage name

n. The pseudonym of an entertainer.

WordNet
stage name

n. the pseudonym of an actor

Wikipedia
Stage name

A stage name, also called a screen name, is a pseudonym used by performers and entertainers such as actors, wrestlers, comedians, and musicians.