The story
- Proto-Iranian · derived from*Raxsā-“swift-flowing”
- Persian · derived fromارس
- Turkish · borrowed fromAras
- English todayAras
From Turkish Aras, from Persian ارس (aras), ultimately from Proto-Iranian *Raxsā- (“swift-flowing”). Compare Sanskrit रङ्घते (raṅghate, “to hasten, run”).
Etymology from Wiktionary, CC BY-SA 4.0.