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Last name Hannemann (Hannemann , Ганнеман ) , in the entire world, is a common cognomen. The family name Hannemann is habitual in Germany, where it is quite a common surname, Denmark, where it is quite a rare surname, and Latvia, where it is a rare surname. Measured by absolute frequency, the name is most common in Germany, the United States, and Brazil. Very seldom, Hannemann is the forename as well as the last name.