Cognomen Detphan (Detphan 
) , worldwide, is a rare surname. The cognomen Detphan is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname, Singapore, and Cambodia, where it is a very rare surname. Not in comparison with a country's population, this name is the most popular in South-eastern Asia, particularly Thailand, Singapore, and Malaysia. Very seldom, Detphan is the forename as well as the last name.