Macro-Siouan languages
In the 19th century, Robert Latham suggested that the Siouan languages are related to the Caddoan and Iroquoian languages. In 1931, Louis Allen presented the first list of systematic correspondences between a set of 25 lexical items in Siouan and Iroquoian. In the 1960s and 1970s, Wallace Chafe further explored the link between Siouan and Caddoan languages. In the 1990s, Marianne Mithun compared the morphology and syntax of all the three families. At present, the Macro-Siouan hypothesis based on relations among Siouan, Caddoan, and Iroquoian is not universally accepted as proven.
Siraya people
The Siraya are Taiwanese Plains Aborigines ("Pingpu") — that is, occupants of flat coastal regions rather than mountain areas. Like other indigenous peoples of Taiwan they are ethnically and linguistically Austronesian. The name "Taiwan" (historically "Taiouwang", and other variants) originated from the Siraya language. The Austronesian language family to which Sirayan belongs includes most of the languages spoken in the western Pacific, including Polynesian, Indonesian, Filipino and Malaysian.