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Last name Merz (Merz , Мерц , מרץ ) , throughout the world, is a common cognomen. The family name Merz is characteristic of Western Europe, particularly Switzerland, where it is quite a common surname, Germany, and Austria, where it is quite a rare surname. In absolute terms, it is the most numerous in Germany, Switzerland, and the United States. Very seldom, Merz is the forename as well as the last name.