Why are red hair people called ginger?
I believe it's because certain people have the chromosome 16 and also have two copies of a recessive allele.
How rare is it to have red hair?
It usually only happens in one or two percent of the population.
What are more common hair colors?
Typically if there is more melanin present the color of the hair is darker.
Why do people with red hair have freckles?
Freckles are easily detected on people who have light skin.