Bagirmi languages
The Bagirmi languages comprise half a dozen languages spoken in southern Chad. They are members of the Central [Sudanic languages|Central Sudanic] language family.
The most populous Bagirmi language is Naba, spoken by the Bilala, Kuka, and Medogo, who together number a quarter million. The languages are:
Ethnologue lists a couple more between Kenga and Naba, and Gula further south, next to Sar.