Surname คำเงิน (Khamngern 
, Khamngoen 
, คำเงิน) , in all the world, is quite a rare cognomen. The family name คำเงิน is habitual in Thailand, where it is quite a rare surname, and Germany, where it is an extremely rare surname. Much less frequently, คำเงิน is the forename as well as the last name.