Cognomen Nadiah (Nadiah 
) , all over the world, is quite a rare surname. The surname Nadiah is characteristic of South-eastern Asia, particularly Brunei, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Singapore. Measured by absolute frequency, it is commonest in South-eastern Asia, particularly Indonesia, Malaysia, and Singapore. More frequently, Nadiah is the forename as well as the last name.