http://www.name-doctor.com/
- lso great information about etymology that I use to cross-reference Behind the Name when that stuff really matters to me.
- (Although I think BtN is a slightly more reliable source, since ND tends to declare etymologies definitively even when they're disputed or uncertain, without mentioning or explaining this; there're lots more notes on BtN, including user-submitted notes from people who also know their stuff.)