Facts about being blonde taken from wikipedia.org:
The word blond was first attested in English in 1481 and derives from Old French blont and meant "a colour midway between golden and light chestnut".
The French (and thus also the the English word) has 2 possible origins. Some linguists say it comes from Middle Latin Blundus, meaning yellow, others say it comes from Old Frankish *blund which would relate it to Old English blonden-feax meaning grey-haired, from blondan/blandan meaning to mix. Also, Old English beblonden meant dyed as ancient Germanic warriors were noted for dying their hair. The linguists who support the Latin origins however say that Middle Latin blundus was a vulgar pronunciation of Latin flavus, also meaning yellow, the word was reintroduced into English in the 17th century from French and was until recently still felt as French, hence blonde for females and blond for males.