Cotoname

Cotoname was a language of the lower Rio Grande valley, spoken across parts of northeastern Mexico and the extreme southern tip of Texas in the United States. It has sometimes been proposed as part of a Pakawan family alongside languages such as Coahuilteco, but it is generally classified as an independent isolate given the lack of firm evidence for such a connection. The main surviving record of the language is a vocabulary collected by the anthropologist John R. Swanton, published in 1940, which remains the principal source for what little is known of its structure and lexicon; the language is believed to have gone extinct around 1900.