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Surname Renz (Renz , 伦兹 , Ренц ) , around the world, is a common cognomen. The cognomen Renz is characteristic of Western Europe, particularly Germany, where it is quite a common surname, Switzerland, where it is quite a rare surname, and Austria. Not in comparison with a country's population, it most frequently occurs in Germany, the United States, and Brazil. Very seldom, Renz is the forename as well as the last name.