Growing up I had a few different names. Chauncemyster was my earliest, I moved on to Zacken, then I was Gogeba for awhile. Eventually I hit Jalaman and it stuck. I think people find it fairly memorable, it's unique, and people tend to have fun with it (Jalalalalalalalaaaa)
It has a pretty random origin. I was making a new WoW character and couldn't think of a name. I had recently been playing a lot of Battlefield 2, on the map Jalalabad. I simply took the Jalala and replaced "bad" with the suffix "man". Eventually I shortened it from Jalalaman to just Jalaman and I've become pretty attached to the name, so I don't see it changing anytime soon