Cognomen Unsan (Unsan 
) , throughout the world, is a rare family name. The surname Unsan is habitual in Philippines, where it is a rare surname, Malaysia, where it is a very rare surname, and Turkey, where it is an extremely rare surname. Not in comparison with a country's population, the name is most common in Philippines, China, and Malaysia. More prevalently, Unsan is the forename as well as the last name.