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Surname Wirth (Wirth , 沃斯 , Вирт ) , around the globe, is a common family name. The cognomen Wirth is characteristic of Liechtenstein, where it is quite a common surname, Malta, and Switzerland (explore the name in all countries). Measured by absolute frequency, it is the most numerous in Germany, the United States, and Switzerland. Very seldom, Wirth is the forename as well as the last name.