Surname Donghan (Donghan 
, 동한 , 冬寒 ) , in all the world, is a rare cognomen. The cognomen Donghan is characteristic of South Korea, where it is a rare surname, China, where it is a very rare surname, and Thailand, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in China, South Korea, and Nigeria. More frequently, Donghan is the forename as well as the last name.