Where does “Ustica” come from?

Ustica (Latin) comes from Latin ustus, from Latin uro, from Proto-Italic ouzō, from Proto-Indo-European h₁ews- — to burn.

Ancestry of “Ustica”, step by step

Step	Language	Word	Meaning
1	Latin	ustus	burnt, inflamed
2	Latin	uro	I burn, consume, inflame; to rage, to ravage
3	Proto-Italic	ouzō	—
4	Proto-Indo-European	h₁ews-	to burn

Ustica — Etymology, Origin & Word History | Etymology Explorer