Where does “オハイオ州” come from?

オハイオ州 (Japanese) comes from Japanese オハイオ, from English Ohio, from Seneca ohiːyoʼ, from Seneca ohiːyoːh — good river.

Ancestry of “オハイオ州”, step by step

オハイオ州 traces back through two separate lines of ancestry.

via Japanese オハイオ

StepLanguageWordMeaning
1JapaneseオハイオOhio
2EnglishOhio—
3Senecaohiːyoʼ—
4Senecaohiːyoːhgood river

via Japanese 州

StepLanguageWordMeaning
1Japanese州state; province of Canada; canton of Switzerland
2Middle Chinese洲—
Every word from Seneca ohiːyoːh →Every word from Seneca ohiːyoʼ →Every word from English Ohio →