Where does “Охоцуку” come from?

Охоцуку (Russian) comes from Japanese オホーツク, from Russian Охо́тск, from Even окат, from Proto-Tungusic *uKe.

Ancestry of “Охоцуку”, step by step

Step	Language	Word	Meaning
1	Japanese	オホーツク	—
2	Russian	Охо́тск	—
3	Even	окат	—
4	Proto-Tungusic	*uKe	—

Охоцуку — Etymology, Origin & Word History | Etymology Explorer