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Last name Groth (Groth , 格罗斯 , Грот ) , all over the world, is a common family name. The surname Groth is characteristic of Denmark, where it is quite a common surname, Germany, and Norway, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Germany, the United States, and Brazil. Much less frequently, Groth is the forename as well as the last name.