The Ndu languages are the best known family of the Sepik languages of northern Papua New Guinea. Ndu is the word for 'man' in the languages that make up this group. The languages were first identified as a related family by Kirschbaum in 1922.Abelam is the most populous language, with about 45,000 speakers, though Iatmül is better known to the outside world. There are eight to twelve Ndu languages, depending on how dialects are classified.