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.
Simeulue Regency
The people of Simeulue are similar to the people in the neighboring Nias Island, speaking 3 languages (Devayan, Sigulai and Lekon) which are distinctly different from the languages spoken in mainland Aceh. The majority of the people of Simeulue are Muslim.