The origin of the Az is disputed; but most researchers agree that they are without much doubt a people of non-Turkic origin who were influenced by neighboring Turkic people and became Turkophones. Most research has been done by Russian linguist experts who trace them as close ethnically to
Ket people of
Yenisei basin in
Siberia due to similarities in name between and the
Assans, who spoke an extinct Yeniseic
Kott dialect. The primary information on their language was collected by
Matthias Castrén in 1845, with further research and information added later by the anthropologist
Dmitry Anuchin. Meanwhile, Az were also hypothesized to be Turkicized descendants of the Iranian-speakers, particularly
Asiani-
Wusun. ==Legacy==