The inclusion of other languages such as Hunnish, Khazar and Sabir within Oghur Turkic remains speculative owing to the paucity of historical records.
Some scholars suggest Hunnish had strong ties with Bulgar and to modern Chuvash[7] and refer to this extended grouping as separate Hunno-Bulgar languages.
[8][9] However, such speculations are not based on proper linguistic evidence, since the language of the Huns is almost unknown except for a few attested words, which are Indo-European in origin, and personal names.
[17] According to the Bulgarian Antoaneta Granberg, the Hunno-Bulgar linguistic situation is further complicated by the extensive migration of nomadic communities of Hunnic and Oghuric peoples from East to West.
This migration brought them into contact with a variety of different lands, neighbors, cultures, and languages, including China and Rome.
Most of these words designate titles and other concepts concerning the affairs of state, including the official 12-year cyclic calendar (as used in the Nominalia of the Bulgarian khans).
The language became extinct in Danubian Bulgaria in the ninth century as the Bulgar nobility became gradually Slavicized after the Old Bulgarian tongue was declared as official in 893.