Nambikwaran

Nambikwaran is a family of about half a dozen languages, all spoken in the Brazilian state of Mato Grosso, with some varieties extending into neighboring Rondonia and Para. It has no demonstrated relationship to any other family and is counted among the world's primary language families. The family has roughly 1,000 speakers combined, of which Nambikwara proper accounts for about 80 percent, or around 720 people; the remaining languages are far smaller, with Mamainde at 250 to 340 speakers, Latunde at 19, and Sabane, Lakonde and Tawande down to single digits or a lone remaining speaker each. At least three of the family's varieties are mutually unintelligible despite once being classified together as dialects of one language.