Western Siouan languages
The Western Siouan languages, also called Siouan proper or simply Siouan, are a large language family native to North America. They are closely related to the Catawban languages, sometimes called Eastern Siouan, and together with them constitute the Siouan (Siouan–Catawban) language family.
Siwai language
Motuna or Siwai, also known as "Telei, Rugara", is a Papuan language of Bougainville Province, Papua New Guinea. The current number of speakers is difficult to estimate since the latest figure (6,000 + 600) is from the 1970 census.