A Look at Some of the World's Rarest Languages Njerep. In Nigeria, there are still four individuals who speak Njerep. ... Kawishana. Kawishana or Kaixana is native to Brazil. ... Paakantyi. Varying reports about the actual number of active speakers of Paakantyi exist. ... Liki. ... Sarsi. ... Chemehuevi. ... Pawnee. Aug 31, 2022