We did rather add bits on to their names:- SmokeyPokey, MintyPooPoo (he had a lot of diarrhoea as a kitten) MurphyPurphy, SimpsonSamson and so on. (I often call my poor husband (Ibrahima) "IbbyBibby", much to his disgust!)
I do love the name of the neighbours' cat who visits me, she's called Pippin. And our other neighbours have Delilah, Tiger Lily and Archie.
My pedigree British Black Shorthair was officially called Ashmere Augustus by his breeder. I won a Premier Medal when showing him at the Cat Fancy shows. But I called him Gussie!