The Yenisei-Ostyak language family is spoken in central Siberia. Only two languages of this family survived into the 20th century, Ket, with around 1,000 speakers and Yugh, which is now extinct. Other probable members of this family, including Arin, Assan, Pumpokol and Kott, have been extinct for over a century. It appears from Chinese sources that a Yeniseian group was among the peoples that made up the tribal confederation known as the Huns. Siberia Siberia (Russian: Сиби́рь, common English transliterations: Sibir, Sibir; possibly from the Mongolian for the calm land) is a vast region of Russia and northern Kazakhstan constituting almost all of northern Asia. ... Ket language, formerly known as Yenisei Ostyak, is a Siberian language isolate, apparently unrelated to any other language in the world (other than Yugh, a recently-extinct language that was clearly related to Ket). ... Yugh(Yug) is usually considered to be an extinct language. ... Many historians consider the Huns (meaning person in Mongolian language) the first Mongolian and Turkic people mentioned in European history. ...

The unrelated Ostyak language is an old name for Khant, a Ugric language. Khants (obsolete: Yugra, Ostyaks) are an endangered ethnic group calling themself Khanti, Khande, Kantek (Khanty), living in the autonomous region Khantia-Mansia in Russian Federation, together with Mansi peoples. ...

Attempts have been made by Soviet scholars to establish a relationship with either Burushaski or the Sino-Tibetan languages, and Yeniseian frequently forms part of the Dene-Caucasian hypothesis, all of which remain speculative at best. The Union of Soviet Socialist Republics (USSR) (Russian: (СССР)  listen?; tr. ... Burushaski (Other names are Burushaski, Brushas, Brushias) is a language isolate spoken by some 50,000-60,000 people in the Hunza, Nagir, Yasin, and some parts of Gilgit valleys in northern Pakistan. ... Sino-Tibetan languages form a hypothetical language family of about 250 languages of East Asia, second only to Indo-European in terms of the number of speakers. ...

Recently, George van Driem (http://www.semioticon.com/people/vanDriem.htm) believes to have found evidence that the Yeniseian family may be closely related to Burushaski in a family he calls Karasuk. Probably the strongest piece of evidence, if true, are the case forms of the pronoun thou. Both the nominative and the accusative cases appear to be related according to van Driem, which makes it seem unlikely that the similarities are due to chance: The nominative case is a grammatical case for a noun. ... The accusative case of a noun is, generally, the case used to mark the direct object of a verb. ...

• Burushaski [ʔu] thou, [gu] thee
• Yeniseian [un] thou, [ku] thee

Van Driem believes thinks the connection wasn't noticed earlier only because Yeniseian is itself so obscure. He postulates that the Burusho people were part of the migration out of Central Asia that resulted in the Indo-European conquest of India. These claims are by no means widely accepted, however. In fact, there is no accusative in Ket or Yeniseic. The forms in question are [uk] thou,and [uk] you-GEN'.