When I first started playing MMO's, way back in the beginnings of Everquest, I was reading this "guide" of sorts that a fellow wrote about playing a Troll Shadowknight.
The game being what it was at the time, this guide was really more about fun RP elements, style of play, etc. One of the big suggestions was to name your character something really memorable and different so people would remember it. I saw a lot of people with the standard "Darkshadownightkiller" names and lots of "Quinthalasaslasa" elfy names and I figured I'd do something totally goofy and named mine after an ice cream flavor, Bovinity Divinity.
The name pretty much stuck and I've used it in pretty much everything I do on the internet now. Sadly WoW doesn't allow surnames so I can't be "Bovinity Divinity" anymore, but Bovinity works just fine.
Of course, it's not as unique as it once was - every damn server has 50 tauren named Bovinity or some variant it seems - and everyone thinks that it has something to do with Tauren in my case too, but oh well.