Siouan languages
Siouan languages can be grouped into the Western Siouan languages and Catawban languages. The Western Siouan languages can be divided into Missouri River languages (such as Crow and Hidatsa), Mandan, Mississippi River languages (such as Dakotan, Chiwere-Winnebago, and Dhegihan languages), and Ohio Valley Siouan branches. The Catawban languages consist only of Catawban and Woccon.
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.