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Surname Lough (洛 , Loch , Lough ) , all around the world, is a common family name. The family name Lough is habitual in Reunion, where it is quite a common surname, Germany, where it is quite a rare surname, and Guatemala. Measured by absolute frequency, it most frequently occurs in China, Germany, and the United States. Much less frequently, Lough is the forename as well as the last name.