This could be an extremely difficult question if your talking in general since people dye their hair all the time (Mine's dyed right now actually) but if you're talking about natural hair color then I believe that would be red hair. I'm not really sure why, it's a matter of genes I guess.
A brown pigment to hair is the most common in the world and therefore the most popular as many people have no desire to change the colour of hair they were born with. Hair colour depends upon melanin and this can vary over time.
His Eye Colour Is Hazel And His Hair Colour Is Brown
Genes carry information relating to physical traits, such as eye and hair colour. If the environment is correct, these genes will be expressed - causing the production of certain colour pigments in the eye and/or keratin in hair in order to produce a colour.
Well, a lot of factors contribute to the colour of peoples hair, E.G. Parents hair colour, where they live, etc. I reckon that the same amount of people have brown hair as the amount of people who have blond hair, ginger, red, black or any other colour. I personally have brown hair.
Red hair is rare because the trait is a recessive gene when paired up with other types of hair. In most cases both sides of the parents have to have that gene to even make it possible. Many people have the trait for red hair, but it takes 2 people with the trait to produce an offspring with red hair, making it twice as difficult. That is why red hair is not typical.
ginger is the rarest natural hair colour in celebrities
Rainbow :)
PURPIL is the VERY RAREST colour of grossman aliens
The color of your hair that you are born with
pink =D
brown
Red is rarest-around 25 percent
Well actually the rarest hair and eye color is burgundy (red and purple and some blonde) and grey eyes which i have or purple hair and violet or green eyes.
The most rarest colour is Black!! Black aliens are normally boys. You can tell if it is! :)
Red and White hair colors are the rarest in the world.
i would say the colour grey
A red diamond is probably the rarest colour for a natural diamond. Flawless diamonds are the rarest in clarity, and large diamonds weighing in excess of 20 carats are rare.