After her birthday on Monday, Lady Gaga is a quarter of a century old. No doubt she'll celebrate in a Gaga-ian fashion, but for now her fans (aka "Little Monsters") are most interested in knowing her real name.Over the past 24 hours, Web searches for "lady gaga real name" and "what is lady gaga's real name" have both spiked into the stratosphere. For the record, her given name is Stefani Joanne Angelina Germanotta. Gaga earned her nickname in an unusual way: According to producer Rob Fusari, "(Lady Gaga) was actually a glitch; I typed 'Radio Ga Ga' in a text and it did an autocorrect so somehow 'Radio' got changed to 'Lady.' She texted me back, 'That's it.' After that day, she was Lady Gaga."Of course, Lady Gaga isn't the only celeb to use a stage name. Hollywood is full of folks who, for various reasons, adopt a different moniker. Here's a breakdown of the most searched "real names" on Yahoo! over the past week. Surprisingly, Gaga isn't No. 1.1. Martin Sheen real name (Ramon Estevez)2. Lady Gaga real name (Stefani Germanotta)3. Triple H real name (Paul Michael Levesque)4. Meat Loaf real name (Marvin Lee Aday) 5. Nate Dogg real name (Nathaniel Hale)6. Charlie Sheen real name (Carlos Estevez) 7. Pink real name (Alecia Moore) 8. Nicki Minaj real name (Onika Tanya Maraj) 9. Judy Garland real name (Frances Ethel Gumm)10. Flo Rida real name (Tramar Dillard)11. Miley Cyrus birth name (Destiny Hope Cyrus)12. Katy Perry real name (Katheryn Hudson)13. Eminem real name (Marshall Mathers)14. Snoop Dogg real name (Calvin Broadus) 15. John Wayne real name (Marion Morrison) 16. Fergie real name (Stacy Ann Ferguson) 17. Gene Simmons real name (Chaim Witz) 18. Wiz Khalifa real name (Cameron Thomaz) 19. Mark Twain real name (Samuel Clemens) 20. Dr. Seuss real name (Theodor Seuss Geisel) 
