Mine is geeky, to say the least.
Basically, it's what is known (well, known to some) in Sweden as LARP-Quenya. That is to say, a version of Tolkiens Quenya, simplified so that one might learn it easily enough to speak when LARPing. For my first LARP, I played a bodyguard elf, so I choose the name Varyaraco, loosely "the guardian wolf". Which I then shorten to Varya (Guardian.
I like it because quite a few of my friends know me by that name since I've only met them when LARPing, it has a nice ring to it, and it's fairly unique so on most sites I can use it without having to add X_x or 666 to make it work.