Also, a Siberian language, alternatively known as Yenisei, Yeniseian, or Yenisei-Ostyak. It has only a few thousand speakers.

It is an isolate, that is it is not known to be related to any other language. There are a number of these scattered across Siberia, and they are sometimes termed Palaeo-Siberian, but this falsely implies that they are related to each other. Some linguists think they can see a distant affinity of Ket with the Sino-Tibetan languages.