An alternative hypothesis was presented by Canadian anthropologist Peter Frost, who claims blond hair evolved very quickly in a specific area at the end of the last ice age by means of sexual selection.According to Frost, the appearance of blond hair and blue eyes in some northern European women made them stand out from their rivals, and more sexually appealing to men, at a time of fierce competition for scarce males.Blond (male), blonde (female), or fair hair, is a hair color characterized by low levels of the dark pigment eumelanin.The resultant visible hue depends on various factors, but always has some sort of yellowish color.Recent archaeological and genetic study published in 2014 found that seven "Scandinavian hunter-gatherers" found in the 7,700-year-old Motala archaeological site in southern Sweden had both light skin gene variants, SLC24A5 and SLC45A2, and that they had a third gene, HERC2/OCA2, which causes blue eyes and also contributes to lighter skin and blond hair.Genetic research published in 20 also indicates that Yamnaya Proto-Indo-Europeans who migrated to Europe in the Bronze Age were overwhelmingly dark-eyed (brown), dark-haired and had a skin colour that was moderately light, though somewhat darker than that of the average modern European.Each of the two forms, however, is pronounced identically.American Heritage's Book of English Usage propounds that, insofar as "a blonde" can be used to describe a woman but not a man who is merely said to possess blond(e) hair, the term is an example of a "sexist stereotype [whereby] women are primarily defined by their physical characteristics." The OED also records that blond as an adjective is especially used with reference to women, in which case it is likely to be spelt "blonde", citing three Victorian usages of the term.
Lighter skin is due to a low concentration in pigmentation, thus allowing more sunlight to trigger the production of vitamin D.
Naturally-occurring blond hair is primarily found in populations of northern European descent and is believed to have evolved to enable more efficient synthesis of Vitamin D, due to northern Europe's lower levels of sunlight.
Blond hair has also developed in other populations, although it is usually not as common, and can be found among natives of the Solomon Islands, Vanuatu, and Fiji, among the Berbers of North Africa, and among some Asians.
However, linguists who favor a Latin origin for the word say that Medieval Latin blundus was a vulgar pronunciation of Latin flavus, also meaning "yellow".
Most authorities, especially French, attest the Frankish origin.