Mecheon
Sacabambaspis
Pathfinder's version of Kara Tur, I forget the name, has it's own special races and a nation of Aasimar, so that is some inspiration there.
Being the snarker I normally am, Pathfinder's version of anything tends to just dump things in place with very little thought to actually making a coherent world.
There's some promise on that whole Aasimar background having some divinity in you, but I don't really think it works on a "Nation" level