GoBot. (or Gizmo)
I really don't like my pledge name at all. I thought that you were supposed to earn your pledge names by f'ing up during the time you're pledging? One of the Brothers at the time just looked at me one day and said "You're an engineering major... you'll be GoBot..."
It was very dissappointing.
But some better ones from my Chapter:
Nips (given because he has no nipples... shaved them off by accident when he was in high school)
Piglet (this kid Jay had this unhealthy obsession w/ Disney, and he tended to be very timid and shy during pledging... like Piglet)
Wet-Wac (my favorite! one of our Brothers Mark was very drunk one night, of his own accord mind you!, and spilled his jungle juice onto our frat house floor. he then proceed to stand up and shout "clean up in aisle 6... I got it!" and dropped to his knees and begin licking the juice off of our soaked-in-God-knows-what rug)
Strawberry Gumdrop (this guy Jim was such a tough guy, ROTC, pretty built, really manly type dude, so I purposely gave him his name as one of the girliest names any of us could think of)
MacGruff (once at a mixer, the sorority chicks were trying to leak fraternity secrets out of this one guy, he drunkenly responded with: "I'm not supposed to talk to strangers." and blew her off.)
That's some highlights... but there are so may more (most of which I can't really explain here...). Anybody else out there have any good ones?