Where does “Pompeii” come from?

Pompeii (Latin) comes from Oscan *pompe, from Proto-Italic kʷenkʷe, from Proto-Indo-European pénkʷe — five.

Ancestry of “Pompeii”, step by step

Step	Language	Word	Meaning
1	Oscan	*pompe	—
2	Proto-Italic	kʷenkʷe	five
3	Proto-Indo-European	pénkʷe	five

Pompeii — Etymology, Origin & Word History | Etymology Explorer