Yes, I've seen the name "Hin" in the Forgotten Realms books. It makes sense that they'd have their own name for themselves that isn't comparing themselves to to another race in potentially a slightly derogatory way. I can also get people suggesting that they wouldn't be particularly bothered, but personally I'd expect that a term would have developed. I'm not familiar with Pathfinder halfling lore, though.
As for mixed race people, I've always assumed that you'd have all sort of diversity going on in a fantasy world and the 'half-whatever' is just a mechanical convenience. We're playing non-remastered, but I like the idea that it's more versatile in the new version
