Yugh is a Yeniseian

Yeniseian languages

The Yeniseian language family is spoken in central Siberia.-Family division:0. Proto-Yeniseian...

 language, closely related to Ket

Ket language

The Ket language, formerly known as Yenisei Ostyak, is a Siberian language long thought to be an isolate, the sole surviving language of a Yeniseian language family...

, formerly spoken by the Yugh people

Yugh people

Yugh people were part of an indigenous group believed to be survivors of an ancient people who originally lived throughout central Siberia. The Yugh people lived along the Yenisei River from Yeniseisk to the mouth of the Dupches River.-Recent history:...

, one of the southern groups along the Yenisei River

Yenisei River

Yenisei , also written as Yenisey, is the largest river system flowing to the Arctic Ocean. It is the central of the three great Siberian rivers that flow into the Arctic Ocean...

 in central Siberia

Siberia

Siberia is an extensive region constituting almost all of Northern Asia. Comprising the central and eastern portion of the Russian Federation, it was part of the Soviet Union from its beginning, as its predecessor states, the Tsardom of Russia and the Russian Empire, conquered it during the 16th...

. In the past it was regarded as a dialect of the Ket language

Ket language

The Ket language, formerly known as Yenisei Ostyak, is a Siberian language long thought to be an isolate, the sole surviving language of a Yeniseian language family...

, which was considered to be a language isolate

Language isolate

A language isolate, in the absolute sense, is a natural language with no demonstrable genealogical relationship with other languages; that is, one that has not been demonstrated to descend from an ancestor common with any other language. They are in effect language families consisting of a single...

. By the early 1990s there were reported to be only two or three non-fluent speakers remaining, and the language is now virtually extinct.