Where does “ओहायो” come from?

ओहायो (Hindi) comes from English Ohio, from Seneca ohiːyoʼ, from Seneca ohiːyoːh — good river.

Ancestry of “ओहायो”, step by step

Step	Language	Word	Meaning
1	English	Ohio	—
2	Seneca	ohiːyoʼ	—
3	Seneca	ohiːyoːh	good river

ओहायो — Etymology, Origin & Word History | Etymology Explorer