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Last name Knus (Knus ) , in all the world, is a rare cognomen. The cognomen Knus is characteristic of Switzerland, where it is quite a rare surname, Finland, where it is a rare surname, and Greece, where it is a very rare surname. Not in comparison with a country's population, it is commonest in Western Europe, particularly Switzerland, Germany, and France. Very seldom, Knus is the forename as well as the last name.