I changed my Abys' names when I got them. Once I knew they would not be used as breeders or show cats I decided on the "one word name" for registering. At the Vet's, when they get issued a prescription or medication, the Vet always adds my last name - Miley Smith, Graemer Smith, Gabe Smith...hehehehehe..makes me giggle every time I see the bottle/tube. Even X-rays have the sir name. My guess is that they use the name of the "payor"...on the check.....and to make appointments.....I did have a Scottish Terrier, long ago, and his name was Jacob Dougherty North (not my sir name, for sure)......He was a fine doggie and lived to be 13. My previous Aby was named Katmandu of _______ ????? <----- the breeder's cattery name.....the usual.....