Surnames Reflect the Hue
Redheads from the British Isles often have surnames that indicate the color of their hair. For example, Flannery means red eyebrows. Flynn implies that the hair is bright red. Reid is another, but that person often has a ruddy complexion.
Fear of Red Hair
Gingerphobia is a real thing and means that the person who has it fears or dislikes those with red hair. Extreme cases can lead to hating all redheads in general. Who could hate someone just because of their hair color?!