1. Prince
    My sister originally named him princess but she didn't realize his gender or something (I used to think all cats were girls too)
  2. CAT!!
    Usually when he's getting annoying (Siamese cats meow A LOT)
  3. Napoleon
    Can't remember if inspired by Napoleon Bonaparte or Napoleon Dynamite
  4. Napo
    Short for Napoleon or possibly after some peace treaty/group
  5. Leo
    My dad started calling him Leo the Lion after he discovered that he's been killing roof rats.