I actually had absolutely no inspiration for my name. I made it up in 2010, when I started playing UrbanTerror, wanting something "dark and mysterious"
I remember wanting something that would roll off of the tongue, and I used the letter 'X' because it's once of the least used letters in the English alphabet.
I'm pretty protective of my handle, I treat it like my own intellectual property-- because it represents me, and because- without a doubt- I made it up. I have had the problem of people stealing it from me though, so I guess there's another Xern out there now... *shakes fist*