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Cognomen Bley (Bley , 布莱 , Блей ) , all around the world, is a common surname. The surname Bley is habitual in Luxembourg, where it is quite a rare surname, Germany, and Ivory Coast. Measured by absolute frequency, it is commonest in Germany, the United States, and Ivory Coast. Much less frequently, Bley is the forename as well as the last name.