Had two kittens brought into the household when I was sharing a house in London years back with Bonnie Shaljean and others - one we thought was female and who was cute and delicate we called Felicity, and the other we thought was her brother and a bit clumsy and ungainly and we called that one Dunstable. Later discovered both were female, but we'd got used to calling her Dunstable by then.
Current cats - Persia (well, I'm not sure how she spells it) chose her own name. She'd been a rescue cat and had been called Mrs Fairford at the shelter, but as she was only a kitten that seemed wrong. We tried names out beginning with "purr" as she was beginning to demonstrate how loudly she could do that and when we reached "Persia" she said "ow", or words to that effect, and did that repeatedly each time we said the name, so that's who she is. We had a Bengal cross kitten for a while and he was Fitzroy as he was the offspring of a pedigree Bengal male and pedigree Burmese female (so the bastard son of a king). He was an adrenalin junky and tried to cross the A40 at night in December (and he was grey) ... we now have the splendid Mylo who fits his name well as again a part pedigree, quarter Bengal who is full of character. Both cats are also Mogs, Moglet, Furs and whatever other names come to mind. They know who we mean.