Cognomen สุ่ม (Sum 
, Coops 
, สุ่ม) , all over the world, is a common last name. The cognomen สุ่ม is characteristic of Hong Kong, where it is quite a common surname, Malaysia, and Singapore (explore the name in all countries). In absolute terms, it is the most numerous in Malaysia, Hong Kong, and Indonesia. Also, สุ่ม is the forename as well as the last name.