Where does “Вакканай” come from?

Вакканай (Russian) comes from Japanese 稚内, from Ainu ヤㇺワッカナイ, from Ainu ナイ.

Ancestry of “Вакканай”, step by step

Step	Language	Word	Meaning
1	Japanese	稚内	—
2	Ainu	ヤㇺワッカナイ	—
3	Ainu	ナイ	—

Вакканай — Etymology, Origin & Word History | Etymology Explorer