Cognomen Baasan (Baasan 
, Баасан 
) , around the globe, is a rare last name. The surname Baasan is habitual in Mongolia, where it is quite a common surname, Indonesia, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. Not in comparison with a country's population, it most frequently occurs in Mongolia, India, and Indonesia. Much less frequently, Baasan is the forename as well as the last name.