Where does “pepo” come from?

pepo (Latin) comes from Ancient Greek πέπων, from Proto-Indo-European pékʷeti, from Proto-Indo-European pekʷ-, from Proto-Indo-European h₃-ép-kʷ-.

Ancestry of “pepo”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	πέπων	ripe, softened; good, sweet, kind; weak, cowardly
2	Proto-Indo-European	pékʷeti	to be cooking; to ripen
3	Proto-Indo-European	pekʷ-	to cook; to ripen
4	Proto-Indo-European	h₃-ép-kʷ-	—