Ona language

[2] A Radboud University linguist worked with two individuals to write a reference grammar of the language, namely, Herminia Vera-Ona (deceased since 2014), a semi-speaker who spoke Ona until the age of 8, and Joubert "Keyuk" Yanten, a young man who started learning the language after learning he was part-Selk'nam at the age of 8.

[3] At the time the grammar was written, the latter was believed to be the only living individual fluent in Selk'nam, albeit not natively.

Joseph Greenberg classifies Selk'nam as an Amerind language of the Southern Andean group, but this categorization is universally rejected by linguists.

Their language, believed to be part of the Chonan family, is considered extinct as the last native speakers died in the 1980s.

A man of mixed Selk'nam and Mapuche ancestry, Joubert Yanten Gomez (indigenous name: Keyuk) has successfully taught himself the language.