Celebs reveal the stories behind their stage names

Lady Gaga - Originally Stefani Joanne Angelina Germanotta, Lady Gaga received her stage name from music producer Rob Fusari.

Lady Gaga - When he was helping her with an album, he compared her sound to Queen's 1984 song 'Radio Ga-Ga,' giving birth to Lady Gaga.

Katy Perry - The singer's real name is Katy Hudson.

Katy Perry - The reason she changed her name is pretty simple: she shared it with actress Kate Hudson.

Bruno Mars - Peter Gene Hernandez was nicknamed Bruno by his dad because as a chunky kid, he resembled pro wrestler Bruno Sammartino.

Bruno Mars - He changed his last name after thinking he'd get mistaken as wanting to make Latin records when his passion was funk and R&B.

The Rock - The American-Canadian actor's first wrestling name was actually Rocky Maivia, which came from a combination of his father and grandfather's wrestling names.

The Rock - Eventually, it was shortened to The Rock. His birth name is Dwayne Douglas Johnson.

Shay Mitchell - This pretty little liar's name is actually Shannon.

Shay Mitchell - She is a big fan of J.Lo, so her friends would call her "Shay Lo" after the Latin artist.

MC Hammer - Singer Stanley Kirk Burrell got his nickname from a childhood job working as a batboy for an athletic club.

MC Hammer - They called him "Little Hammer." It changed to "MC Hammer" when he picked up the mic and began singing.

Miley Cyrus - Destiny Hope Cyrus legally changed her name to Miley Cyrus when she was 15.

Miley Cyrus - Because she was always smiling as a kid, people called her "Smiley," which later became Miley.

Snoop Dogg - Rapper Calvin Broadus was nicknamed "Snoopy" as a child.

Snoop Dogg - His parents thought he looked like the famous cartoon dog.

Portia de Rossi - De Rossi's real name is Amanda Lee Rogers. She changed her name at age 15.

Alessia Cara - Alessia Cara's actual last name is Caracciolo, of Italian origin. Now it's Cara for short.

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