Mine stems back a number of years - over 25 in fact. It was a group at college for the fantasy game Dungeons and Dragons
and we drew the names for our characters out of the proverbial hat. I drew Dwarf
, so that is what I use on forums. If I find that it has already been used, I just stick my year of birth on the end so that it becomes Dwarf63
. I'm just glad that I didn't draw Fairy
Also see the following threads: Usernames
and How did you pick your screen name?