Where does “Օդեսա” come from?

Օդեսա (Armenian) comes from Russian Оде́сса, from Ancient Greek Ὀδησσός.

Ancestry of “Օդեսա”, step by step

Step	Language	Word	Meaning
1	Russian	Оде́сса	Odessa
2	Ancient Greek	Ὀδησσός	—

Օդեսա — Etymology, Origin & Word History | Etymology Explorer