Garnet, Amethyst, Aquamarine, Diamond, Emerald, Pearl, Ruby, Peridot, Sapphire, Opal, Citrine, Topaz. . . . Well, it's all gemstones but, i think some of it are a good name for a cat too.
The most I can say is that get the cat and watch it and then give it a name. I had a クモ, スパイダー and didn't know what to name it, and then I named her Spaz because she was Spazing out a lot.
Ok so I really don't like to go によって cliche cat names like Pussy または Fluffy または Snowball または anything like that. If I got a cat (or several) I'd name them after like musicians I like and have shaped my life and my desire to write songs and play ギター and sing. Some names would include Bowie, Freddie, Lou, Iggy etc. I'd like my cat(s) not to have a name that's overused または downright offensive (imagine calling your cat Pussy. That should be considered animal abuse). I'd like them to have unique non-offensive names.