Peregrin Bitterleaf.
Then there's some character names from Diablo 2 Characters: An Amazon named MachineHead (yes, for a time she was "Slayer Machinehead" and if this universe contained any narrativum at all, she would have shot arrows of gold and other Heavy Metals) and another Amazon (specialized on bows) called Stalinorgel.
That last one is from the same guy who called his sword in D&D "Hans the Guardian"
A wizard's name I use from time to time arose from a typo: Verions (someone wanted to write version, and I thought Verions sounded good for a wizard)
A druid had to name his (dire elephant) animal companion:
"I call him Claude"
"Like Van Damme?"
"No, not 'claude' - 'K.L.O.T'"
Crude name for a crude animal, trained to stomp on halflings
And we had quite a lot of names that were corrupted by the players - we drove one player/DM nuts by changing his (N)PCs' names.
There was Orlin Thabbar who became Ornithopter.
Okxavidus we only called "Oxi" (or "Oxyclean", follwed by some jokes about some cleaning agent. The fact that this character fell into a stream of faeces in the sewers in our very first adventure ever doesn't help)
Some names got corrupted not because they sounded bad, but because their characters stank. To this day, "doing a Zed Copp" means completely losing at everyhing, after a blackguard named Zed Copp who had the most rotten luck I ever saw: He was beaten up by old ladies, violated by dwarves when he lay on the street, and a lot of other unpleasant things. The only big save he ever made was the one he wanted to fail: When he had enough of the character and wanted to kill himself (which never worked, though the DM was being difficult there), the DM finally took pity on the poor player and sent a Cosmic Flash of Death down at the blackguard. And the blackguard made his save. Evasion. Too incpometent even to die.
Do people count? One guy from a gaming group I used to play in is called "Moo" because he played a minotaur once.