Cognomen Japang (Japang 
) , all around the world, is a rare family name. The cognomen Japang is characteristic of South-eastern Asia, particularly Brunei, where it is quite a rare surname, Malaysia, where it is a rare surname, and Indonesia, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in India, Indonesia, and Malaysia. Very seldom, Japang is the forename as well as the last name.