All over the world, Sieng (Sieng 
, เชียงแสน 
) is a rare dominantly male, but uncommonly female first name. The forename Sieng is characteristic of Vietnam, where it is a very rare boy's name, Thailand, where it is a very rare unisex name, and France, where it is a very rare male name. In absolute terms, it is commonest in Vietnam, the United States, and Thailand. More prevalently, Sieng is the last name as well as the forename.