Cognomen Yongsu (용수 
, Yongsu 
, 永素 ) , in the world, is a rare surname. The family name Yongsu is habitual in South Korea, where it is a rare surname, China, where it is a very rare surname, and Spain, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in China, South Korea, and India. Much more prevalently, Yongsu is the forename as well as the last name.