Siouan languages
Siouan or Siouan–Catawban is a language family of North America that is located primarily in the Great Plains, Ohio and Mississippi valleys and southeastern North America with a few other languages in the east.
Sikaiana language
Sikaiana is an Austronesian language in the Ellicean family. Its sister languages include Kapingamarangi, Nukumanu, Nukuoro, Nukuria, Ontong Java, Takuu, and Tuvaluan.