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Surname Grath (格拉斯 , Grath , 格拉思) , across the world, is quite a rare last name. The cognomen Grath is habitual in Ireland, where it is quite a common surname, Austria, where it is quite a rare surname, and Denmark, where it is a rare surname. Measured by absolute frequency, it is commonest in Ireland, Germany, and Austria. Very seldom, Grath is the forename as well as the last name.