Katy Perry, Bruno Mars, Rihanna, Tom Cruise, Calvin Harris, Miley Cyrus and Ellie Goulding all changed their names when they found fame.Real name: Karla Camila Cabello EstrabaoReal name: Nicolas Kim CoppolaReal name: Rory GrahamReal name: Peter Gene HernandezReal name: Robyn Rihanna FentyReal name: Alecia Beth MooreReal name: Stefani Joanne Angelina GermanottaReal name: Cornell Iral Haynes, Jr.Real name: Michael OmariReal name: Adam Richard WilesReal name: Caryn JohnsonReal name: Amethyst Amelia