Here's a roundup of some geeky names from around the web.
Bewitching Names has a great post about Ender, from the novel Ender's Game by Orson Scott Card, and Rue, from the Hunger Games.
Mer de Noms talks about Sheldon and Leonard from The Big Bang Theory, profiles a few names from The Periodic Table, and sheds some light on Pi.
Baby Name Pondering ponders Narnia and Phoenix, which is the alter ego of Jean Grey in X-Men. Phoenix is also the name of Zefram Cochrane's first warp drive ship in Star Trek: First Contact.
The Name Station defends Ryker.