Where does “Эдо” come from?

Эдо (Russian) comes from Japanese 江戸, from Japanese 江, from Old Japanese え.

Ancestry of “Эдо”, step by step

StepLanguageWordMeaning
1Japanese江戸Yeddo
2Japanese江inlet, bay; large river; Alternative spelling of...
3Old Japaneseえ—
Every word from Old Japanese え →Every word from Japanese 江 →Every word from Japanese 江戸 →
Эдо — Etymology, Origin & Word History | Etymology Explorer