What's the matter with the rest of the world and Hitler? You won the damn war, you can stop villanizing him now
Bill Gates isn't evil, he's just rich. At least he's much less evil than I am. If I had that much money I'd probably hire a private army and take over the world. And the name itself doesn't sound very evil either.
And my suggestion for the most evil name would be Cthulhu. Can't you feel the aura of maevolence the word has?