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.
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.