Waikuri language
Waikuri (Guaycura, Waicura) is an extinct language of southern Baja California. The Jesuit priest Baegert documented words, sentences and texts in the language between 1751 and 1768.
Waikuri may be, along with the Yukian and Chumashan languages and other languages of southern Baja such as Pericú, among the oldest languages established in California, before the arrival of speakers of Penutian, Uto-Aztecan, and perhaps even Hokan languages. All are spoken in areas with long-established populations of a distinct physical type.
Classification
Baegert's data is analyzed by Raoul Zamponi (2004). On existing evidence, Guaycura appears to be unrelated to the Yuman languages to its north. Some linguists have suggested that it belonged to the widely scattered Hokan phylum of California and Mexico (Gursky 1966; Swadesh 1967); however, the evidence for this seems inconclusive (Laylander 1997; Zamponi 2004; Mixco 2006). William C. Massey (1949) suggested a connection with Pericú, but the latter is too meagerly attested to support a meaningful comparison. Other languages of southern Baja are essentially undocumented, though people have speculated from non-linguistic sources that Monqui (Monquí-Didiú), spoken in a small region around Loreto, may have been a 'Guaicurian' language, as perhaps was Huchití (Uchití), though that may have actually been a variety of Guaycura itself (Golla 2007).