I had a hard time naming mine, too. The nice thing is that once the right name comes up, it just sort of clicks.
My two beardies are brother and sister, so I wanted them to have a paired name, like Bonnie & Clyde, Roslin & Adama, etc. I'm a geek, so I like to give them sci-fi or scientific names if I can. I just couldn't find the right names, though, so I asked several of my friends to come up with some. One came up with Leto & Ghanima, who are Paul Muad'dib's children in the classic sci-fi series Dune. As you can probably guess, the books are centered on a desert planet, and since beardies are from the desert and the characters are brother/sister (twins, actually), the names were perfect.
In case anyone is wondering, they're pronounced LAY-toe and GAN-ih-mah.