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Last name Hertz (Hertz , Herc , Герц ) , in the world, is a common cognomen. The family name Hertz is habitual in Denmark, where it is quite a common surname, Germany, where it is quite a rare surname, and Israel. Measured by absolute frequency, it is commonest in the United States, Germany, and Denmark. Very seldom, Hertz is the forename as well as the last name.