How do red hair and Rh- blood connect?

Red/reddish hair is common in Rh negatives.

You may or may not have red hair per se, but chances are, there is some shading present.

What type of red is your hair?

Many Rh negatives have auburn hair.

Red-Haired Rh Negative Tribes

So.. which ancient tribes were famous for red hair being more common?

Rh- Tribes: The Sarmatians (Amazon Warrior Women)

Is red hair Celtic?

Does red hair come from Neanderthals?

Yamna culture: The origin of the Celts

12 Similarities between Rh(D) negative individuals and people with red hair

Women with red hair worse off health-wise

Are rh negative people more likely to have red hair and/or freckles?

Red hair is extremely rare it only goes above 1% west of Poland, north of central Spain, and south of northern Scandinavian and Finland and also over 5% in Volga Russia. Besides that it is almost non existent. Red hair is definitely the most unique hair color in the world. Originally all Humans had black hair so having red hair is just as crazy as having blue or green hair. I think most people would be surprised that red hair is mentioned in ancient writing and that there was a Roman emperor who was a redhead. That out of the very little over 3,000 year old human remains were we can tell hair color two were redheads and found in tarium basin China. There is actually a lot of info to help figure out the origin and history of red hair. There is no doubt red hair goes very far back in pre historic times. I know this is not ancient history but 3 of the first 7 USA presidents had red hair(Thomas Jefferson 3, James Monroe 5, Andrew Jackson 7)

https://www.eupedia.com/forum/threads/29019-Origin-and-ancient-history-of-red-hair

So… which other ancient tribes had a lot of redheads among them?

Red-Haired Rh Negative Tribes (Part 2)

Ancient Tribes: The Ligures

Rh Negative Mysteries: The Etruscans

Are rh negatives more likely to have wavy hair?