At this point you may be thinking that we're smoking too much of that pipe with Gandalf, but have you noticed Snow White's rapport with the birds and beasts of the wild? The way they listen and respond to her?
Doesn't this suggest a deep connection with nature, as someone with Elvish blood would have?
If you are one of the ten people who read through The Lord Of The Rings without skipping the songs, you might remember the hymn some Elves sing to the goddess Varda. The song refers to the goddess by several names: Elbereth, Gilthoniel ... and also Snow-white. She's a full-on goddess, so naming your kid Snow White in Gondor would be like a Texan naming his kid John Wayne or Ronald Reagan. Just a way to show how devout you are.
On the flip side, we have the wicked Queen. We know she has to be of the blood of Numenor, because Gondorians are awfully racist. And what do you know, there are a bunch of Numenoreans who are wicked and practice the dark arts: the Black Numenoreans. It isn't even unprecedented for one to marry her way to the throne: The Lord of The Rings includes a throwaway reference to "the cats of Queen Beruthiel." Beruthiel is described in Unfinished Tales as keeping tabs on her subjects with a secret police of telepathic cats. Because of course she did. Why wouldn't she have that?