My dad's olive skin and dark eyes, from his mom...and she was part French...he always thought came from his dad's Scottish heritage...those Spanish sailors who came ashore along Scotland's rocky coast...and canoodled with a few red headed local maidens. When he grew a beard and moustache, they came in red!
The incidence of red-hair is the same in Libya as it is in Ireland.
The only way a White group (such as the French in this case whom are Anglos) have that "dark" gene is because of the Arabs they came in contact with. It works as follows:
One of your "dad's side" probably had an outsider's blood in them from 800 years ago. French and Italians whom already 700 years ago were pillaged by the Moors (dark people) from Northern Africa, had already spread the gene and possibly that was the case. The Roman whom the French were at war with one of them already carried the gene and they had contact and suddenly the "dark" gene is transfered also across the French now.