supernatural name theme, someone help?

I have 3 gerbils, 1 male and 2 female.. I don't really no anyone to ask this except other supernatural fan but I'm looking to interesting and creative names from the tampil for the 2 females. They don't have to be actual names like I named the male Colt, after the obvious. But I'm stuck on names for the girls. Alot of the names in supernatural are pretty ordinary to say the least (Jo, Ellen, Pam, Jess, Mary...) so I'm stuck. I wanted something creative that made it where anda really had to be a fan to see the theme behind it. Anyone able to help out here?