When I was 9, my mom adopted a boy and girl cat from the same litter.
The boy's official name was "Daring-Do", cause if it was daring, he'd do it! But the name we always called him was "Dum-Dum". He really wasn't very smart.
The sister was named "Innocence", cause she'd always look at you like, "What?? I'm innocent....wasn't me!"
All 3 of my kitties have regular official names, but Samson's other names are Pinhead, Fluffernutter, Nermal and The Brain.
Ranger's other names are Pinhead, Snoopy, Odie and Pinky(he has a pink nose, and it would have gone well with Samson's other name, The Brain.
Emmy's other names are Pinhead and Garfield.
(By the way, in case you're wondering about the name Pinhead? That's what my hubby thinks we should have just named them all)