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It's actually a girl's name to me, because the first time I heard of it as a first name, the bearer was female. The bearer in question being Hadley Richardson (1891-1979), the first wife of famous American writer Ernest Hemingway (1899-1961):

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http://en.wikipedia.org/wiki/Hadley_Richardson

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Her granddaughter, American actress Mariel Hemingway (b. 1961), has Hadley as a middle name.