I know the Simpsons pretty well and I've never heard his last name mentioned. I could be wrong, so I'm sitting on the fence for now!
I think it is just otto. There is a chance that I am wrong, but then again I watch the Simpsons 6 times a week. I know the only word maggie ever said, dada and a bunch of other worthless stuff. I just need a little help with something. You know comic book guy, he told his name to flanders what was it? I can't remember.
Alright I think I found the answer. I havent checked out the episode but I saw a transcript online. Remember when Otto gets his drivers license? On his new license his name says Otto Mans according to the transcript.
And whatever you say goes right? Wouldn't want to piss you off and have you privately email me to have me piss off out of a thread. Remind me, are you a moderator? Didn't think so! You know, some people on here are real jerks. I though this was suppose to be a peaceful place. I guess not al get that message.