Cute thread topic!
I'm going to sound nuts, but my husband likes fish. We have a tank filled with various Disney characters names such as Chum (the rainbow shark), Pooh, Piglet, Tigger, Shir Khan (the tiger barbs), Zazu the red and blue betta, and Olaf the albino crawfish.
I recently got a gerbil that we tritely named Rat-a-tella. It doubles as a reference to Ratatouille and Cinderella as I usually call her Ella.