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.
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.