In Dwarf Fortress, a particularly nefarious carp had killed two of my fishermen. The game granted it a name and title, the name was Zezibesh (or Zezibeth, I don't even recall anymore).
I've had my username since I was about 6. Around that age I was signing up for every site that I came across but there was this one site that had all the usernames that I wanted taken. So I decided to smack my head on the keyboard and this is what I got. The numbers came when amazingly someone had already taken this username on a site so I added the numbers.