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Cognomen 상수 (상수 , Sangsu , Sang-Soo ) , in the world, is a rare surname. The surname 상수 is habitual in South Korea, where it is a rare surname, Thailand, where it is a very rare surname, and Malaysia. Measured by absolute frequency, it is commonest in South Korea, China, and Thailand. More frequently, 상수 is the forename as well as the last name.