I hope this hasn't already been posted.   I didn't see it as I was looking through resources.

I'm one of those players that loves to give characters allegorical names.  As I was googling, I came upon this site: http://www.behindthename.com/themes.php (and promptly started geeking out happily!)   It lets you click to see names that fall into a category ("light" names, "names related to flowers" etc)

I hope others find it as useful as I'm no doubt about to :D