Where does “usticese” come from?

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

Ancestry of “usticese”, step by step

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

Every word from Proto-Indo-European h₁ews- →Every word from Proto-Italic ouzō →Every word from Latin uro →