My grandfather (100% Norwegian) had olive skin, black hair and dark brown eyes. My dad figured he had the blood of some Mediterranian slave girl that the Vikings had brought home.
Until he visited distant relatives up in northern Norway - Lapland. Pretty much tall, skinny Eskimos! (Still lived part-time in their Reindeer hide huts herding Reindeer.)
My husband is dark skinned, and has black hair, and is often mistaken for being Arab or Hispanic, by people of those persuasion. My son got a DNA test and his father’s side is only French and Celtic, and related to King Duncan. No native American or black.