It's kinda a family name. My dad used KILLJOY as any of his videogame character names online and offline. Then I took up the moniker, and now my little brother has too. Haha we each have different Roman numerals on Xbox live. Tried to make it so we'd have I, II, and then III. But they were taken so now we have XI, XVI, and I can't remember lil bros. I'll probably have my kid do the same for kicks, which may be soon ;)