We made a rule that all our animals have to be named after book/movie characters we like (or at least from books and movies we like) so our cats are:
Nessarose Margaret Hamilton Lastname because I'm a huge Wicked fan, nn Nessa.
Lambert the Sheepish Lion nn Bert though we pretty much exclusively call him Bertram now
Rue, yes from the Hunger Games, it was between that and Katniss (get it? Get it?)