Someone here tried to say that redheadedness comes from African admixture.
If that were true, how come the highest concentrations of redheads in the world are in Europe, especially the British Isles?
As far as jews and arabs go, one reason why these groups have a relatively high proportion of redheads is due to inbreeding(red hair is a recessive gene). So, it's kept in the family in more ways than one. It's understandable why someone would think it to be a trait of a certain group of people, but for most people, they would think of the Britons.