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Last name ルーサー (Luther , Rusa , Reuther ) , all over the world, is a common cognomen. The cognomen ルーサー is habitual in Marshall Islands, where it is quite a common surname, Seychelles, and Germany. Not in comparison with a country's population, it most frequently occurs in the United States, Germany, and Indonesia. Also, ルーサー is the forename as well as the last name.