Sounds like a neat project!
Here is mine:
First off, I am a girl. Alot of people see Jeff and think otherwise.
Several years ago my dad bought a slot-car track that came with some NASCAR characters. I ended up picking the Jeff Gordon car, since I liked the colors (didn't really know about NASCAR, and I'm definitely not a Gordon fan). Well, we were all giving ourselves names that went with the NASCAR driver, so Dad and I came up with Jeffretta McGordon.
Jeffretta is an easy name to use as a username, since it's never taken unless I have been on the site before.