It was the Golden Age of gaming on the SNES and Final Fantasy 4, 5, and 6 in their prime (before it turned to riced out crap) when I was exposed to the internet. Exdeath, the name which is a contraction of "exceeding death", is the supernatural antagonist of FF5. At the time I played it, was in Japanese on the SNES, years before it was ever translated or released in the States in any form, and I was pretty stoked to get to experience it.
It started with the very first random java web chat where I typed in an online alias for the first time. Somehow it just stuck, I'm a sucker for consistency.
Other names I use frequently are Kahran/Kahr and Krelian, mostly for game characters. The Xenogears saga was a pretty moving experience for me... one expansive philosophical story for a mere PS1 game. It ranks with Shakespeare's best. (see sig for Xenosaga, only spiritually related to and not to be confused with the original and far superior Xenogears). Nearly all my online game characters are named after Xenogears/Xenosaga characters.