Cool Hair Color Rarity References. 1 to 2% of the world’s population of 7.7 billion people is about 77,000,000 to 154,000,000. The tone of the hair is dependent on the ratio of black or brown eumelanin to yellow or red pheomelanin.
Web red hair is the rarest natural hair color in humans. However, only 3% of people. Only 2% of the population has natural red hair, so it’s not very common.
