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Cognomen Grouch (Grouch , Груш ) , in all the world, is a very rare last name. The cognomen Grouch is habitual in Israel, where it is a rare surname, Belarus, where it is a very rare surname, and Kazakhstan. Not in comparison with a country's population, it is commonest in Russia, the United States, and Israel. Also, Grouch is the forename as well as the last name.