No
genealogical relationship between Ainu and any other language family has been demonstrated, despite numerous attempts. Thus, it is a
language isolate. Ainu is sometimes grouped with the
Paleosiberian languages, but this is only a geographic blanket term for several unrelated language families that were present in easternmost Siberia before the advances of Turkic and Tungusic languages there. A study by Lee and of
Waseda University found evidence that the Ainu language and the early Ainu-speakers originated from the Northeast Asian/
Okhotsk population, which established themselves in northern Hokkaido and expanded into large parts of
Honshu and the
Kurils. The Ainu languages share a noteworthy amount of vocabulary (especially fish names) with several Northeast Asian languages, including
Nivkh,
Tungusic,
Mongolic, and
Chukotko-Kamchatkan. While linguistic evidence points to an origin of these words among the Ainu languages, its spread and how these words arrived into other languages will possibly remain a mystery. The most frequent proposals for relatives of Ainu are given below:
Altaic John C. Street (1962) proposed linking Ainu,
Korean, and
Japanese in one family and
Turkic,
Mongolic, and
Tungusic in another, with the two families linked in a common "North Asiatic" family. Street's grouping was an extension of the
Altaic hypothesis, which at the time linked Turkic, Mongolic, and Tungusic, sometimes adding Korean; today Altaic sometimes includes Korean and rarely Japanese but not Ainu (Georg et al. 1999). From a perspective more centered on Ainu, James Patrie (1982) adopted the same grouping, namely Ainu–Korean–Japanese and Turkic–Mongolic–Tungusic, with these two families linked in a common family, as in Street's "North Asiatic".
Joseph Greenberg (2000–2002) likewise classified Ainu with Korean and Japanese. He regarded "Korean–Japanese-Ainu" as forming a branch of his proposed
Eurasiatic language family. Greenberg did not hold Korean–Japanese–Ainu to have an especially close relationship with Turkic–Mongolic–Tungusic within this family. The Altaic hypothesis is now rejected by the scholarly mainstream.
Austroasiatic Shafer (1965) presented evidence suggesting a distant connection with the
Austroasiatic languages, which include many of the indigenous languages of Southeast Asia. presented his reconstruction of Proto-Ainu with evidence, in the form of proposed sound changes and cognates, of a relationship with Austroasiatic. In , he still regarded this hypothesis as preliminary.
Language contact with the Nivkhs The Ainu appear to have experienced intensive contact with the
Nivkhs during the course of their history. It is not known to what extent this has affected the language. Linguists believe the vocabulary shared between Ainu and
Nivkh (historically spoken in the northern half of Sakhalin and on the Asian mainland facing it) is due to
borrowing.
Language contact with the Japanese The Ainu came into extensive contact with the Japanese in the 14th century. Analytic grammatical constructions acquired or transformed in Ainu were probably due to contact with the Japanese language. A large number of Japanese loanwords were borrowed into Ainu and to a smaller extent vice versa. There are also a great number of
loanwords from the Japanese language in various stages of its development to Hokkaidō Ainu, and a smaller number of loanwords from Ainu into Japanese, particularly animal names such as (猟虎, 'sea otter'; Ainu ), (馴鹿, 'reindeer'; Ainu ), and (柳葉魚, a fish,
Spirinchus lanceolatus; Ainu ). Due to the low status of Ainu in Japan, many ancient loanwords may be ignored or undetected, but there is evidence of an older substrate, where older Japanese words which have no clear etymology appear related to Ainu words which do. An example is modern Japanese or (鮭), meaning 'salmon', probably from the Ainu or for 'salmon', literally 'summer food'. According to P. Elmer (2019), the Ainu languages are a
contact language, i.e. have strong influences from various Japonic dialects/languages during different stages, suggesting early and intensive contact between them somewhere in the
Tōhoku region, with Ainu borrowing a large amount of vocabulary and typological characteristics from early Japonic.
Other proposals A small number of linguists suggested a relation between Ainu and
Indo-European languages, based on racial theories regarding the origin of the Ainu people. The theory of an Indo-European—Ainu relation was popular until 1960; later linguists dismissed it and concentrated on more local language families. Tambovtsev (2008) proposes that Ainu is typologically most similar to Native American languages and suggests that further research is needed to establish a genetic relationship between these languages. == Geography ==