Yungblud
The British rapper wasn't born with this name, either. His birth name is Dominic Richard Harrison but goes by Yungblud or YUNGBLUD professionally. He is a singer, songwriter, and actor, and was previously in a relationship with another fake-named singer, Halsey.
Machine Gun Kelly
Born Richard Colson Baker, Machine Gun Kelly (or MGK), got his start in the music industry after being inspired by Eminem and Ludacris. Fans gave him the stage name due to his rapid-fire lyric delivery.