Cognomen Diadi (Diadi 
) , around the globe, is a rare last name. The surname Diadi is habitual in the Democratic Republic of the Congo, where it is a rare surname, Cameroon, and Georgia, where it is a very rare surname. Measured by absolute frequency, it is commonest in the Democratic Republic of the Congo, Indonesia, and Cameroon. Much less frequently, Diadi is the forename as well as the last name.