Family name 윤석 (윤석 
, Yunseok 
, Yun-Seok 
) , worldwide, is a rare cognomen. The family name 윤석 is characteristic of South Korea, where it is a rare surname, Cambodia, where it is a very rare surname, and Thailand, where it is an extremely rare surname. Not in comparison with a country's population, the name is most common in South Korea, China, and Thailand. Much more frequently, 윤석 is the forename as well as the last name.