Surname Thwang (Whang 
, Thwang 
) , around the world, is quite a rare cognomen. The cognomen Thwang is characteristic of Singapore, where it is quite a rare surname, Hong Kong, and Malaysia, where it is a rare surname. In absolute terms, it is commonest in the United States, Malaysia, and Canada. Very seldom, Thwang is the forename as well as the last name.