stage name; professional name
Used for performers, entertainers, and artists who adopt a name different from their legal name for professional purposes.
彼女は芸名で活動している。
She works under a stage name.
This stage name was given to me by my master.
She has gone by this stage name ever since her debut.
He hides his real name and works under a stage name.
Before his debut, the agency came up with a stage name for him.