Where does “Πόντος” come from?

Πόντος (Pontic Greek) comes from Ancient Greek Πόντος, from Proto-Hellenic *póntos.

Ancestry of “Πόντος”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Πόντος	Pontus, a region on the southeastern shores of...
2	Proto-Hellenic	*póntos	—

Πόντος — Etymology, Origin & Word History | Etymology Explorer