I get a lot of questions for naming my cat Tonks, after the Harry Potter character! It was suggested by a friend on the first day I brought her home, when he and my housemates were trying to play a board game. She was so overly friendly he reminded her of the character. It stuck, but when I tell people her name, they're like "Like the girl in Harry Potter?!"
A friend of mine had a cat that was named LC. It stood for LOST CAT, since it was a stray that showed up one day and never left. Another friend's family had a cat named Ibsk, which stood for itty bitty sheity kitty. The cat was a 4lb pain in the butt who hated everyone except one member of that family! Cute cat, but just so surly!