. The hypothesis of Proto-Kyrgyz and Proto-Oghuz interaction
We know from historical records that starting from 552 AD some of the Great-Steppe tribes were subdued by the Göktürks, who, essentially, were the speakers of Orkhon-Oghuz-Karakhanid. Presumably, the Göktürk language-dialect must have acquired a high sociolinguistic status in many Turkic-speaking societies of the time. We also know that Oghuz, that belongs to the Orkhon-Oghuz-Karakhanid grouping, and Kimak, that belong to the Great-Steppe grouping, share multiple similar phonological, lexical and grammatical innovations. Finally, we know that the Kyrgyz-Kazakh subgrouping (or Karluk-Kyrgyz-Kazakh subgrouping, as long as we assume that Karluk tribes were close to Kyrgyz tribes) is particularly close to Kimak.
Consequently, we can infer that somewhere around c. 500-800 AD there occurred a strong linguistic exchange between the early Oghuz and Kyrgyz dialects which could have resulted in the formation of Proto-Kimak. Moreover, the most simple and probable hypothesis which would explain the relatedness between Proto-Oghuz, Proto-Kimak, and Proto-Kyrgyz-Kazkah, would be that the area of Proto-Kimak was originally just a transitional geographic area between early Proto-Kyrgyz-(Karluk) and Proto-Oghuz, where these two languages overlapped and intermingled with each other.
The plausible hypothesis would be that, initially, Proto-Kyrgyz-Karluk (or Proto-Kyrgyz) was probably a conservative Turkic language located north of the Irtysh, between the Irtysh and Ob rivers, essentially in the area known as the Baraba and Kulunda Steppe, also possibly including some areas of the Altai Mountains.
The overlapping of Kyrgyz with the Oghuz area soon resulted in the formation of a new transitional dialect, which became known in history as Kimak. This Kimak area shared archaic linguistic features both with Kyrgyz-Karluk, on one hand, and innovative features with the early Oghuz, on the other.
Furthermore, Oghuz too was affected by Kimak and Kyrgyz dialect-languages; it absorbed some of their elements, becoming part of the Great Steppe Sprachbund, thus deviating from its Orkhon-Karakhanid parent stem.
On the other hand, the speakers of Kyrgyz-Karluk were largely unaffected by Göktürk dialect-languages because it was buffered in the Kimak area. Consequently, they may have formed a linguistic refugium near the Altai Mountains. Afterwards, according to scanty historical evidence, the early Kyrgyz and Karluk languages seem to have formed as a result of a later migration from the Altai Mountains towards the Tarbagatai Ridge, and the Zhetti-Su (the Seven Waters) region located between Lake Balkhash and the Tian Shan Mountains. This migration must have occurred most likely between 630-750 AD, thus creating the basis for the early Karluk and, probably, for the Kyrgyz (of Kyrgyzstan) languages. It was perhaps the political turmoil in the Western Turkic Kaganate, which allowed the Karluks to seize power in the Zhetti-Su area by about 766. In 840, there was likely to be a second wave of Kyrgyz migration to the Zhetti-Su (sources?) that ended political domination of the Karluks and apparently brought the name of "Kyrgyz" to the present-day Kyrgyzstan.
Conclusions:
As the Western Göktürk tribes speaking a language similar to the early Old Uyghur moved back from Mongolia into the upper reaches of the Irtysh river c. 550-700 AD, they came into contact with the local western Proto-Kyrgyz tribes. This intermingling must have resulted in the formation of three local dialectal areas:
(1) the Proto-Kyrgyz (possibly including Proto-Karluk) area that was almost unaffected by the Göktürk language and which ultimately led to the emergence of Karluk, Tian-Shan Kyrgyz, and finally, much later, after the 15th century, Kazakh and Karakalpak people;
(2) the northern Proto-Kimak area that was strongly affected by Oghuz or Western Göktürk, but retained many older Kyrgyz elements, such as -w- in bawïr "liver", and -w in taw "mountain", as opposed to the -G- and -G in the oncoming Orkhonic (Oghuz) language), to name just the most typical ones;
(3) the southern Proto-Oghuz area which acquired certain features from Kimak, but otherwise remained relatively unaffected, retaining many Orkhon-Karakhanid archaisms from an older period.
In other words, the formation of the three subtaxa — Proto-Karluk-Kyrgyz-Kazakh, Proto-Kimak-Kypchak-Tatar, and Proto-Oghuz-Seljuk — could have been the result of a back-migration of Western Göktürks or Orkhon Old Turkic or Old Uyghur or Oghuz speakers into the Kazakhstan Great Steppe from the Dzungarian Desert, eastern Tarim Basin or nearby regions, and their linguistic exchange with the local Kyrgyz or Karluk tribes
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