extinct Northwest Caucasian language once spoken by the Ubykh people
via Wikipedia infobox
(Learn how and when to remove this message)
Ubykh was a Northwest Caucasian language once spoken by the Ubykh people, an ethnic group of Circassians who originally inhabited the eastern coast of the Black Sea before being killed or deported en masse by Russia to the Ottoman Empire during the Circassian genocide.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).