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.