I have blond hair.
 blonde (female), or fair hair, is a hair color characterized by low levels of the dark pigment 
And is grey hair when it loses all pigment?
color can be from the very pale blond (caused by a patchy, scarce distribution of pigment) to reddish "strawberry" blond or golden-brownish
And is blond the most common hair color?
Interestingly,Red hair (or ginger hair) occurs naturally in 1–2% of the human. 
What about blond hair?
"blond" is first documented in English in 1481 and derives from Old French "blund, blont",