I usually have some sort of naming theme for animals as well! The themes that stick out the most in my head are the time I did USA states with birb puns for my chickens, flowers for my cows, and another time I named my hens after my WoW raid guildmates haha.
I really need to start playing this. I had it on pre-order but life has thrown me a lot of curveballs lately. I spent HOURS on both the boy and girl Gamecube versions, so I know it's going to scratch a nostalgic itch. I'll be a lady marrying Nami this time around, which I'm very excited about