You may run into someone who has the look, but that is not what matters. A person can have ancestry from the same regions rh negative blood originates, but not be rh negative… medically and mentally speaking.
I have experienced the vibe on both sides and many times you meet someone with the large eyes and red hair, but their reaction to real thoughts is limited.
They make up their mind quickly and tune out when it becomes interesting.
Then there are others of ancestry dominant in their genepool giving them the look not associated with rh negative blood, but when you converse, you realize you’re not losing each other.
That is when you just know if someone else is rh negative or not.