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.
Pedee people
Little is known about what language the Pedee spoke. Based on a theory proposed by James Mooney in his 1894 "Siouan Tribes of the East", and reinforced by John R. Swanton in his 1936 essay "Early History of the Eastern Siouan Tribes", the Pedee are believed to have spoken a Siouan language, specifically an "Eastern" or "Southeastern" Siouan language. No vocabulary of the Pedee language has been recorded.