Family name สีม (Sim 
, สีม 
) , in all the world, is a widespread surname. The last name สีม is habitual in South-eastern Asia, particularly Malaysia, where it is a common surname, Singapore, and Brunei (explore the name in all countries). Measured by absolute frequency, it is the most numerous in South-eastern Asia, particularly Malaysia, Singapore, and Indonesia. Very seldom, สีม is the forename as well as the last name.