The Siouan language is a Native American language family that includes six languages: DAKOTA (6 letters), Lakota (6 letters), Osage (5 letters), Omaha (5 letters), Winnebago (9 letters), and Oto (3 letters). These languages are spoken by the Sioux, Crow, and other tribes in the Great Plains region of North America. The Siouan language family is one of the largest language families in North America, with over 30 distinct dialects.