Cognomen 해원 (Haewon 
, 해원 , Hae-Won 
) , globally, is a rare family name. The cognomen 해원 is habitual in South Korea, where it is a rare surname, Hungary, where it is a very rare surname, and Spain, where it is an extremely rare surname. Measured by absolute frequency, it most frequently occurs in South Korea, China, and Hungary. Much more prevalently, 해원 is the forename as well as the last name.