Last name Vanthanh (Vanthanh 
) , in all the world, is a very rare family name. The cognomen Vanthanh is characteristic of Malaysia, where it is a very rare surname, Vietnam, and Germany, where it is an extremely rare surname. Measured by absolute frequency, the name is most common in Vietnam, Malaysia, and China. Likewise, Vanthanh is the forename as well as the last name.