Who: Whoopi Goldberg
Real name: Caryn Elaine Johnson
The actress and talk show host decided to go with the name Whoopi because of—wait for it—a whoopee cushion. She's stated that "if you get a little gassy, you've got to let it go. So people used to say to me, 'You're like a whoopee cushion.' And that's where the name came from." Um, ew. And as for Goldberg? It's been reported that her mom felt that Johnson wasn't "Jewish enough" to make it in showbiz. Odd, considering most actors with traditionally Jewish names change them to something more ethincally ambiguous.
The origin of the Welsh name "Arthur" remains a matter of debate. Some suggest it is derived from the Roman nomen gentile (family name) Artorius , of obscure and contested etymology  (but possibly of Messapian    or Etruscan origin).    Some scholars have suggested it is relevant to this debate that the legendary King Arthur's name only appears as Arthur , or Arturus , in early Latin Arthurian texts, never as Artōrius (though it should be noted that Classical Latin Artōrius became Arturius in some Vulgar Latin dialects). However, this may not say anything about the origin of the name Arthur , as Artōrius would regularly become Art(h)ur when borrowed into Welsh .