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Surname Namkoong (Namkoong , 남궁 , ナムグン) , all over the world, is quite a common cognomen. The family name Namkoong is habitual in South Korea, where it is quite a common surname, Malta, where it is quite a rare surname, and Japan, where it is a very rare surname. In absolute terms, it is the most numerous in South Korea, the United States, and Japan. Very seldom, Namkoong is the forename as well as the last name.