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Cognomen Riemann (瑞曼 , Riemann , Риман ) , in all the world, is quite a common family name. The cognomen Riemann is characteristic of Germany, where it is quite a rare surname, Denmark, and Austria, where it is a rare surname. In absolute terms, it most frequently occurs in Germany, the United States, and Denmark. Much less frequently, Riemann is the forename as well as the last name.