My first yorkie's registered name was Katie Scarlett O'Hara of Tara (can you tell I'm a Gone With The Wind fan?...LOL). There was no kennel name to use so this was what I came up with. When we got Gabby, we named her Gabrielle's Jewel (Jewel was her mother's name). And then we have Gage who is just, well, Gage...we rescued him from someone here in town who just didn't want him anymore. And since he didn't have papers, Gage is not registered.
As they say, be creative - go with something fun. The more unique, the better