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Some beilieve that blonde hair evolved as a means of showing maturity: very light blonde meaning too young for coupling, darker blonde meaning suitable for child-bearing, and darker blonde meaning nearing the end of child-bearing age. I don't know how much credence to give these ideas, but I find them interesting.
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There is another theory that blonde hair first evolved in women in and around the last ice age in northern climates. The theory is that there was a shortage of fit young men due to the incredible tough and sometimes hazardous living conditions among hunter gatherer people who eeked out a living in Europe and much of western Asia at the end of the last Ice Age, and blonde hair evolved naturally among women who were competing to make themselves more attractive to men who could look after them. The attraction of blonde haired women to men has remained ever since, and it is known that Roman women sometimes dyed their hair blonde for the same reason that modern women do.
Blonde and red hair and blue and green eye colour is also relatively common among people who have no direct links with Europeans, but probably have some ancient European genetic links across Asia and North Africa, especially the Pathans of Pakistan, India and Afghanistan, the Kurds and the Berbers of North Africa. But it also occurs naturally among people who have no link to Europeans, such as Australian aboriginals and Native Americans in parts of South America.