One surprising things the Gra wrote is "The root of the souls of gentiles is from heaven and the root of souls of Israel is from the earth." From what I recall this is from his commentary on Shir Hashirim chapter two [right at the start of the chapter]. So the idea of superiority because of birth seems to be in accurate.

I saw a similar idea in Rav Luria on Genesis in a verse on the three sons on Noah.I.e., that their root was from the three names "I will be" אלף הי יוד הי. אלף הא יוד הי. אלף הה יוד הה.