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Last name 광수 (광수 , Kwangsu , Gwangsu ) , throughout the world, is a rare family name. The surname 광수 is characteristic of South Korea, where it is a rare surname, Cambodia, where it is a very rare surname, and Germany, where it is an extremely rare surname. In absolute terms, it is commonest in South Korea, China, and Germany. Predominantly, 광수 is the forename as well as the last name.