Northern Yukian language
Northern Yukian, also known as Ukomnoʼm, is an extinct language of California, formerly spoken by the Yuki people. The Yuki are the original inhabitants of the Eel River area and the Round [Valley Indian Tribes of the Round Valley Reservation|Round Valley Reservation] of northern California. Yuki ceased to be used as an everyday language in the early 20th century and its last native speaker, Arthur Anderson, died in 1983. Northern Yukian is generally thought to be distantly related to the Wappo language.
Revitalization efforts are currently underway, and the language is taught at the grade-school level at the Round Valley Indian Tribes of the [Round Valley Reservation|Round Valley Reservation].
Classification
Northern Yukian consisted of three dialects, from east to west: Round Valley Yuki, Huchnom and Coast Yuki. These were at least partially mutually intelligible, but are sometimes counted as distinct languages.These languages are categorized as Northern Yukian within the Yuki–Wappo family, which also includes the distant Wappo language. It is thought that the ancestor of the Yukian languages diverged from Wappo around 1500.
The three Northern Yukian languages diverged from each other over the last one thousand years, while dialectal variations in Wappo are even more recent. The most likely catalyst or, at least, influence on the separation of Northern Yukian and Wappo was the expansion of the Pomo, leading to pomoization of the Wappo language and physical separation between the Yuki and the Wappo tribes.