Where does “Odesa” come from?

Odesa (English) comes from Ukrainian Оде́са, from Ancient Greek Ὀδησσός.

Ancestry of “Odesa”, step by step

Step	Language	Word	Meaning
1	Ukrainian	Оде́са	—
2	Ancient Greek	Ὀδησσός	—

Odesa — Etymology, Origin & Word History | Etymology Explorer