I had a similar experience to WMLute. Back in the mid-to-late '90s I played Air Warrior on the old AOL "pay to play" routine where you paid by the hour for AW becaue it was considered a "premium game". I came across an add for it on AOL and, since I enjoy flight sims, I thought I'd check it out.
When I tried to create my name, everything was already taken - and every bastardization of anything I wanted was also taken. Finally I tried to come up with a word that I thought would be short, and easy for my fellow flyboys to say or type and the first thing I tried, "Caz1", was accepted.
I flew under that call sign for the C-land team for several years. Wound up joining the "Grim Reapers" squad flying under Pappi right before the end. Then EA bought out Air Warrior and attempted to "upgrade" it. Shortly thereafter life ended as we know it (they killed the game).
Some years later, when I learned of Aces High 2, I tried my old call sign and got it. So I've stayed Caz1. Name means nothing, and sounds like everything else.