Siouan languages
Siouan or Siouan–Catawban is a language family of North America that is located primarily in the Great Plains, Ohio and Mississippi valleys and southeastern North America with a few other languages in the east.
Sioux
The Sioux (), also known as , are groups of Native American tribes and First Nations peoples in North America. The term can refer to any ethnic group within the Great Sioux Nation or to any of the nation's many language dialects. The modern Sioux consist of two major divisions based on language divisions: the Dakota and Lakota.