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Cognomen Fahy (فاهي , Fahy , 费伊 ) , around the world, is quite a common last name. The family name Fahy is habitual in Ireland, where it is quite a common surname, Jersey, and Australia, where it is quite a rare surname. In absolute terms, the name is most common in Ireland, the United States, and the United Kingdom. Very seldom, Fahy is the forename as well as the last name.