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.
Macro-Siouan languages
The Macro-Siouan languages are a proposed language family that would include the Siouan, Iroquoian, and Caddoan families. Most linguists remain unconvinced that these languages share a genetic relationship, and the existence of a Macro-Siouan language family remains a subject of debate.