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.
Siuslaw language
Siuslaw is usually considered to belong to the Penutian phylum, and may form part of an Coast Oregon Penutian subgroup together with Alsea and the Coosan languages.