Stupid question but why is blond hair so common among people from lebanon syria turkey?

A lot of people have lighter hair as children all over the world just like a lot of blacks or biracial children are a bit lighter before the age of 2 or 3. Don't know why. I do know that a lot of peple who are blond in the southern Europe are not really pure blond if you know what I mean. It's more of a light, sandy brown color than like my hair color.