Mûmakanin (Mu.) or Mûmakanda was a language from Middle-earth's Utter South. It was the main language spoken in Mûmakan and the Mûmakani-ruled lands.
Speculations[]
The word "Mûmak" is one of the few words known from Tolkien's Haradrim Languages. It's often supposed to be derived from the Arabic term Mumak-kinu meaning Provider of Space. The Mûmakanin language used in the Merp Modules was loosely based on Old Abyssinian vocabulary.