Cognomen ทองอุ่น (Thongun 
, ทองอุ่น, Thongaun ) , all around the world, is a rare surname. The cognomen ทองอุ่น is habitual in Thailand, where it is a rare surname, and India, where it is an extremely rare surname. Much less frequently, ทองอุ่น is the forename as well as the last name.