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Surname Krantz (Kranz , Krantz , Krans , among others...) , throughout the world, is a common cognomen. The cognomen Krantz is habitual in Liechtenstein, where it is a common surname, Sweden, where it is quite a common surname, and Germany. Not in comparison with a country's population, this name is the most popular in Germany, the United States, and Sweden. Much less frequently, Krantz is the forename as well as the last name.