Do you have "themes' for your pet/farm animal names?

Sometimes I'm lazy and let the random name generator pick my animal's names, I admit it. But other times I'll come up with a theme for each of my animals. For instance, all of my pigs are named after famous cop characters (from Brooklyn Nine Nine and Law & Order SVU specifically). My cows are named after Adventure Time characters, and my goats/sheep are matching Disney Prince/Princesses (I have 6 of each so there aren't too many).

Do you have any theme for naming your animals? Or do you just choose them at random?