Uvtha- When I was like 15 or 16 I was big into ccgs, one of which being the LoTR ccg which included cards for the 9 nazgul, one of which was named "Uvatha the Horseman" (which I think was just made up for the game), and while at a friends one night, who had just gotten an internet connection (a very primitave one) and we went to some chat room, and I entered in my name by mispelling/misremembering "Uvatha" as "Uvtha", and later after realizing I made the mistake, I just decided to keep it, liking it better than the regular spelling.
"Ikichet", I just picked a random ratman sounding name. "Ratitichaki" (my alt) was just the neatest sounded name that ratmen could spawn with. "Bazerion" (other alt) named after the UO wizard lord npc, as I had an idea to start an evil mage guild, but I gave up on the idea quickly.
My LS guys "WaBaooie" and "Riller", are just random names I made up on the spot, "Mongbat" (fromerly "A Mongbat" before a GM changed it for some odd reason after 5 years using it) becuase I just thought it would be funny to name myself after the weakest being around (not to trick people into attacking me like EVERYONE thought)
"Not a thief" which was my smith, because I thought it would be funny to be the lone "not a thief" to actually not be one (there were dozens of such people but all of course WERE thieves),
"Torgo", from the excellent MST3K episode "Manos: The hands of fate", whom I never played really, I just made a character when I got the 6th slot one night to visit a friend, but I had stopped playing ls for siege exclusivly by then so there he sits unworked. I also name all of my test chars Torgo as well.