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Last name הרץ (Hertz , Herz , הרץ ) , across the world, is a common cognomen. The cognomen הרץ is habitual in Denmark, where it is quite a common surname, Germany, and Bahrain (explore the name in all countries). Not in comparison with a country's population, it is commonest in Germany, the United States, and Israel. Very seldom, הרץ is the forename as well as the last name.