Almost never. On time my dentist asked if I had slavic ancestry because my teeth go very deep into my head. Basically I'm pretty white, there's probably some native in there but I'm not interested enough to find out for sure.
Kind of reminds me about a comediand (can't remember who), who made a joke about how if you call a Korean guy Chinese, or a Puerto Rican guy a Mexican they get really mad, but when you say a Dutch guy is French he doesn't care. Talking about ancestry, not citizenship. Funny stuff.