Surname ดำรง (Damrong 
, Dumrong 
, Dhumrong ) , all over the world, is a rare family name. The cognomen ดำรง is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname, Singapore, where it is a very rare surname, and Malaysia. Measured by absolute frequency, it is commonest in Thailand, the United States, and China. More prevalently, ดำรง is the forename as well as the last name.