The most common hair color in the world is black or dark brown. Natural black or dark-brown hair is found in 75-84 percent of the world's population (depending on the study). 2. Brown hair is the world's second-most prevalent hair color, with 11 percent of the population natively brunette. There are several shades of brown but light golden brown is the most common color for those who aren't black or white. Native brown hair occurs almost exclusively as a result of pigment loss due to illness or malnutrition and is found mostly in Africans and Native Americans. Other common hair colors include red, blond, grey, and black. Red hair is the most common hair color in the world among people of European descent. It accounts for about 15 percent of all hair colors. Blond hair is most common in Northern Europe and the United States; it makes up about 10 percent of all hair colors. Grey hair is common among the elderly; it accounts for about 8 percent of all hair colors. Black hair is most common in Africa and Asia; it makes up about 7 percent of all hair colors. There are many types of hair colors that occur less frequently including silver, carmine, purple, orange, green, and blue. Silver hair is the most common form of color among Caucasians; it makes up about 6 percent of all hair colors. Carmine hair is most common among Italians; it makes up about 1 percent of all hair colors.