I made it up four years ago, in a matter of seconds, off the top of my head, for a forum (the first forum I ever visited, when I didn't even know what they were) where I didn't intend to stay for more than five minutes.

I've still yet to use anything else, which makes me wish I really put more thought into a screen name I'll likely be stuck with forever. I've thought about changing it many times, but the longer I use it, the harder it is to establish yourself under a different identity.

I didn't think about the way it sounded when I signed up for my first forum; I just threw together a few random letters. It took me literally about ten seconds.

'S', 'E', 'P', and 'H' are the four letters of the first half of the name of Final Fantasy VII's main villian, Sephiroth.
'Z', and 'O' and the first two letters of Zophar, the main villain of Lunar 2: Eternal Blue. The first 'o' was thrown in because it made the two parts transition slightly better, and the alternating punctuation is present because it was all the rage during the time, and I was hip and cool.