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Family name Krug (Kro , Krug , Круг ) , across the world, is a common last name. The surname Krug is habitual in Germany, where it is quite a common surname, Austria, and Paraguay, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Germany, India, and the United States. Much less frequently, Krug is the forename as well as the last name.