I don't use random name generators nor do I flip through a book of names. Instead, I just... think them up. Something that sounds appropriate. I don't try to give their names any explicit connection to secret abilities they have. The key is that it reflects their culture and gender and sounds cool. I also tend to spend like an hour fiddling around with a name, morphing it here and there. Like I started out with Guatama and an hour later I had Gwyshton. But for not so major chars I just make them up on the fly. Don't know how to describe it any better than that.