Khasa language
Khasa Prakrit is a Prakrit language of medieval South Asia and a common ancestor language of the Pahari languages, which includes Nepali, Kumaoni, Jaunsari, Mandeali, Kangri, Mahasui and Garhwali languages. It was commonly referred to as खश, खष, and खशीर in the Sanskrit texts.
Indian linguist Suniti Kumar Chatterji suggests that Nepali language developed from Khasa Prakrit. Khas Prakrit is named after the speakers of language, Khas people, who live in the Himalayas.