É a minha interpretação. Ver abaixo.

"Teton or Tetonwan (uncertain, perhaps "Dwellers on the Prairie"): the westernmost Sioux, known for their hunting and warrior culture, and are often referred to as the Lakota."

"The Lakota (IPA: [laˈkˣota]) (also Teton, Tetonwan) are a Native American tribe. They are part of a confederation of seven related Sioux tribes (the Oceti Sakowin or seven council fires) and speak Lakota, one of the three major dialects of the Sioux language."

"The Lakota were originally referred to as the Dakota when they lived by the great lakes, however, because of European settlement they were pushed away from the great lakes region and later called themselves the Lakota which became part of the sioux. After their adoption of the horse, šų́ka-wakhą́ ([ˈʃũka waˈkˣã]) ('dog [of] power/mystery/wonder') their society centered on the buffalo hunt with the horse. There were 20,000 Lakota in the mid-18th century. The number has now increased to about 70,000, of whom about 20,500 speak the Lakota language.
After 1720, the Lakota branch of the Seven Council Fires split into two major sects, the Saone who moved to the Lake Traverse area on the South Dakota-North Dakota-Minnesota border, and the Oglala-Sicangu who occupied the James River valley. By about 1750, however, the Saone had moved to the east bank of the Missouri River, followed 10 years later by the Oglala and Brulé (Sičangu)."

(Retirado da Wikipedia)