Siouan languages
Authors who call the entire family "Siouan" distinguish the two branches as "Western Siouan" and "Eastern Siouan" or as "Siouan-proper" and "Catawban". Others restrict the name "Siouan" to the western branch and use the name "Siouan–Catawban" for the entire family. Generally, however, the name "Siouan" is used without distinction.
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.