Now, I'm no expert, so I don't know if just naming your kid after your favorite D&D character is the highest honor, or the skeeviest error, like naming her after your psycho ex-girlfriend (and not telling your wife that's where you got the name).
So if your own portfolio of character names are either covered or off the table, but you'd still like to come up with a powerful name for your little Dungeon Master-to-be, check out this message forum on D&D Online for some expert discussions of name generating techniques. [WARNING: Level-10 apostrophe field in effect]
Oh, and talk it over with your partner first. Because the fact that you have one, and are having a child makes me think you never told her about your little D&D phase...
Character Naming Techniques [D&D Online Official Forums]
related: Buy Robert Foster's The Complete Guide to Middle Earth, a canonical Tolkein naming bonanza [Amazon.com, or just pull it off the shelf, human]
previously: LOTR Baby Names