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.
Lakota people
The Lakota (pronounced , Lakota language: Lakȟóta) are a Native American tribe. Also known as the Teton Sioux (from "Thítȟuŋwaŋ"), they are one of the three Sioux tribes of Plains. Their current lands are in North and South Dakota. They speak "Lakȟótiyapi"—the Lakota language, the westernmost of three closely related languages that belong to the Siouan language family.