Family name Wonsuk (Wonsuk 
, 원숙 , วอนสุข ) , worldwide, is a rare last name. The family name Wonsuk is habitual in South Korea, where it is quite a rare surname, Thailand, where it is a very rare surname, and Malaysia. In absolute terms, the name is most common in South Korea, Thailand, and China. More frequently, Wonsuk is the forename as well as the last name.