Cognomen 瀚 (瀚 
, Hàn 
, 한 
) , in the world, is a widespread family name. The last name 瀚 is characteristic of South Korea, where it is a common surname, China, where it is quite a rare surname, and Vietnam, where it is a rare surname. Much less frequently, 瀚 is the forename as well as the last name.