Pets should always be allowed to name themselves. If you watch them for a while they will tell you their names.

I had AKC Springer Spaniel hunting dogs with registered names of Cash Out the Window, (he wasn't very good at hunting), Eightball, (because he was just a big goof), Onee, (firstborn puppy, but you can't register a number as a name), a current one named Tater Tot with a call name of Tater because potato head is too hard to say.

And don't ask how I renamed a cat my Wife had to Fuckin' Cat. He really seemed to take pride in that name too.