Where does “Pompei” come from?

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

Ancestry of “Pompei”, step by step

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

Pompei — Etymology, Origin & Word History | Etymology Explorer