Question: how rare is it to have brown hair and brown eyes?
Answer: Brown hair color is also polygenic and roughly 11% of the population have brown hair. The genes for hair color is found on chromosomes 3, 6, 10, and 18. ... Since blue eyes is 8%, I think that's pretty rare, and brown hair is 11%, that's also rare, it follows that blue eyes and brown hair should be rare as well.