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.
Catawba people
Albert Gallatin (1836) classified the Catawba as a separate, distinct group among Siouan tribes. When the linguist Albert Samuel Gatschet visited them in 1881 and obtained a large vocabulary showing numerous correspondences with Siouan, linguists classified them with the Siouan-speaking peoples. Further investigations by Horatio Hale, Gatschet, James Mooney, and James Owen Dorsey proved that several tribes of the same region were also of Siouan stock.