2020 · National redhead Day By Numbers 2% – The percentage of the world’s population with red hair. 0.17% – The percentage of the world’s total population who are blue-eyed redheads, making it the rarest colour combination for all human beings. 26 mai 2023 · Are redheads more sensitive to pain? Are they going extinct? Here are 16 fun facts all about redheads on their unofficial holiday May 26, World Redhead Day.