Yup it certainly happens! There's some village in Asia somewhere, where the typical body type is sort of "mongolian" (while I can't remember the exact details I read, I don't think that it actually was in Mongolia).

However, every now and then, blond hair and/or blue eyes pop up in children.

Some genetic testing supposedly links to some ancestry similarities with people in the area that is currently Finland.

There is some historical evidence of a Finnish (or whatever they called themselves when they lived there) group of families packed up and left, headed east, never to be heard from again. It is theorized that perhaps this little footnote in the history books may link these families to this Asian village.