Margoth, Voldemort... and I think "Lucifer" actually means "Bringer of light" or something along those lines. Ms and Vs and letters like that usually imply an evil person, as well as Ss and Ts with a vowel between them.
Vulcan, Vladimir, Xander, Avery etc. If you are going for a more refined and older villain. If your villain is younger I'd go with something such as Damon, Beck, Val,Elijah etc.Definitley stay away from over used and common ones.