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Last name Harz (Hart , Hars , Harz ) , all over the world, is a widespread family name. The family name Harz is habitual in British Virgin Islands, where it is a common surname, Aruba, where it is quite a common surname, and Guernsey (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in the United States, the United Kingdom, and Germany. Very seldom, Harz is the forename as well as the last name.