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.
Fort Ancient
Here, Fort Ancient culture was at its height. Only one known Fort Ancient tribe has been verified by name in the historical record-- the Mosopelea, presumably of southeast Ohio. There is also a chance that a Siouan people called the Keyauwee, who appear alongside the Tutelo (an Eastern Siouan tribe from West Virginia) in North Carolina around 1700 could also have been of Fort Ancient stock. During the French explorations, a Ho-chunk native named Tonti told them that these people had been known as the "Chonque". Mosopelea language is marked as being the only known Siouan tongue to use the "f" sound, which is far more common among the Muskogean languages of the Mississippians.