You’d be surprised how many names a cat can figure out are theirs. I have at least 3 for one of my cats. And any of those 3 will have her running to me if I call. Doesn’t matter which one. Cats are very intelligent. Make up a cute nickname that you like, call kitty that, and your daughter can still call him Earl/Earl Grey/whatever makes her happy. The cat will figure it out and understand.