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Family name Keum (Keum , 금 , كيوم ) , worldwide, is quite a common surname. The family name Keum is characteristic of South Korea, where it is quite a common surname, Sudan, where it is a rare surname, and Singapore. Not in comparison with a country's population, the name is most common in South Korea, India, and the United States. Very seldom, Keum is the forename as well as the last name.