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Kalto, or Nahali, is an Indo-Aryan language of India. Kalto is the endonym; the exonym "Nahal" or "Nihal" is disparaging. Because of the name "Nahali", the language has often been confused with Nihali, an apparent language isolate spoken by a neighbouring people with a similar lifestyle.
References
Kalto at Ethnologue (18th ed., 2015) (subscription required)