What's the Siouan language?
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.