That's extremely likely. Indeed, for (a) ethnicity and (b) geography, it's obvious that these correlate with ancestry; people tend to marry within their neighbo

That's extremely likely. Indeed, for (a) ethnicity and (b) geography, it's obvious that these correlate with ancestry; people tend to marry within their neighbourhood and within their clan. That's one reason why the principal components of genetic data tend to map rather neatly to geography, and why genes can be used to make inferences about past populations.