Black ,yes black . Now this is something I never thought about , Almost everyone else (Aisens , Africans etc) have black hair
Now for the other three
Brown is the second most common hair color ( my hair) .I do,not know the exact numbers ,but somewhere like 10% people have brown hair
Blond is the second rarest hair colour I think 3-4%
Red heads ! Is the rarest hair colour in the world 1-2% of people have red hair ( including my best friend and her sister .)
P.S. Red hair and blue eyes is the rarest combo ( my best friend has that combo)