I also liked the point you made about how there are a lot of ancient languages that would make more sense for a race of creatures that existed even before modern humans, as evident by Mr. Oliver. If you don't mind, can I keep that notion for my own vampires?

Sure thing :).

Even a French-English dictionary would have helped. "Source" translates as "fonte"; "fountain" is "fontaine". I wish I knew how LKH stumbled on "sourdre", because it's such a strange jump.