Where does “Ὀρόντης” come from?

Ὀρόντης (Ancient Greek) comes from Old Median Arēvand, from Proto-Iranian raivant-, from Proto-Indo-European reh₁ís — wealth, goods.

Ancestry of “Ὀρόντης”, step by step

Step	Language	Word	Meaning
1	Old Median	Arēvand	—
2	Proto-Iranian	raivant-	—
3	Proto-Indo-European	reh₁ís	wealth, goods

Ὀρόντης — Etymology, Origin & Word History | Etymology Explorer