I've only ever used a few usernames in my life.
In 2001 I started the internet with
mewmewtwo@hotmail.com.
Just one year later I epiphanized 'Eranegera' from the recesses of my mind, and used that until 2006/07 some time. I actually got my name changed on WolfRO v2 to Zageron, after being a part of it as Eranegera for over a year. The username Zageron stuck.
I have a few other usernames: ZaggySource, Zaggy, Zaggywon, Tazaterra, and Zageron Telerain.
but I will stick with Zageron until I find something more vocally appealing.
(Pronunciation for those who suck)
Za-ger-on, E-ra-neg-er-a.
Edit: I invented these names back in 2002 and 2004 respectively, playing a real life role playing game with my neighbor. (Internet did not develop my names.) Also at the time of conception, and to this day, Eranegera is unique to me. Zageron was taken as a name at some point without my knowledge, but hey I haven't copywritten them yet. ;D