No race living on Golarion is actually from here! Everyone just got plopped here from different planets. Heck the elves will even admit it if you know who to ask.
Elves and Dwarves started out as the same race. Elves were the girls and Dwarves were the boys. It was only a weird curse that split them into two different races. Some escaped the curse though, and live on in the elven homeland. They're called Lashunta or something.