ニヴフは新石器時代から樺太に住んでいたと推定される
>The Nivkh people are believed to be the descendants of an indigenous population that inhabited Sakhalin island since the Neolithic period.[1]
https://en.wikipedia.org/wiki/Mongol_invasions_of_Sakhalin

ウリチの遺伝子プールからアイヌの影響が17.8%か13.5%ほど確認される
>A genetic analysis in 2016 showed that the Ulchi are related or at least influenced by the Ainu and their ancestors the Jomon people. According to the study, the Ainu-like genetic contribution in the Ulch people is about 17,8% or 13,5%.[7]
https://en.wikipedia.org/wiki/Ulch_people