Oldest version I can find for the lady is the medieval tale during Lancelot's quest for the holy grail. It's "Viviane" in that version. Hah, it'd be funny if her name had two V's compared to the one who has the letters in his initials
As for the parallels, yes I do see them, but by no means do I think we should measure the depth of the characters by such standards which is what Dann was trying to do in associating C.C as being evil because of your association of her to Morgan La Fay.