The term Naga people (Burmese: နာဂ, Hindi: नागा) refers to a conglomeration of several tribes inhabiting the North Eastern part of India and north-western Burma. The tribes have similar cultures and traditions, and form the majority ethnic group in the Indian states of Nagaland, Manipur, Arunachal Pradesh and Assam.
The Naga speak various distinct languages, which each belong to branches of Tibeto-Burman, including Angami–Pochuri, Ao, Kukish, Sal, Tangkhul, and Zeme. In addition, they have developed Nagamese creole, which they use between tribes and villages, which each have their own dialect of language. http://en.wikipedia.org/wiki/Naga_people
Interestingly, they are more closely related to the Japanese, by genetic distance, than other groups geographically closer to Japan: