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.
Assiniboine language
The Dakotan group of the Siouan family has five main divisions: Dakota (Santee-Sisseton), Dakota (Yankton-Yanktonai), Lakota (Teton), Nakoda (Assiniboine) and Nakoda (Stoney). Along with the closely related Stoney, Assiniboine is an n variety of the Dakotan languages, meaning its autonym is pronounced with an initial n (thus: "Nakʰóta" as opposed to "Dakʰóta" or "Lakʰóta", and "Nakʰóda" or "Nakʰóna" as opposed to "Dakʰód" or "Lakʰól"). The Assiniboine language is also closely related to the Sioux language and to the Stoney language (likewise called Nakoda or Nakota), although they are hardly mutually intelligible.