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.
Sikaiana language
Sikaiana is an Austronesian language in the Ellicean family. Its sister languages include Kapingamarangi, Nukumanu, Nukuoro, Nukuria, Ontong Java, Takuu, and Tuvaluan.