Family name ตง (Tong 
, ตง 
, Dongsing 
) , throughout the world, is a widespread last name. The family name ตง is habitual in Macao, where it is a common surname, Hong Kong, and Bermuda (explore the name in all countries). Measured by absolute frequency, it is commonest in China, Malaysia, and Hong Kong. Much less frequently, ตง is the forename as well as the last name.