You ask for names NOT used, all you get is names from book/show/toys.
I'd suggest looking at older names, names that were popular when/where your characters were born. Like if she was born in New York in 1900 to Italian parents, her name might be Teresa or Antonella.
Other than that, you might play around with words like "wolf", "bat", or "blood" (or other word associated with vampires), adding prefixes or suffixes, or looking up the words in different languages and then playing around with them.
Or they could be references to other vampires, like Cara Mills (Caramilla).
Victoria (Not from Twilight)
Elizabeth (Such an old yet always classic name for a female vampire & vampire victim)
Damon (Pronounced Duh-Moan)
So first you need some interesting but not weird names I spent a while thinking but I came up with Hazel as its different, for boys I spent hours wandering on a great name so here it is....Lance, it's a Victorian and Tudor name so if you had a vampire which was a bite lets say 90 years ago it would work! Hope these helped the Cox