Where does “Illa” come from?

Illa (Catalan) comes from Old Catalan illa, from Vulgar Latin isula, from Latin Īnsula, from Proto-Italic enselā.

Ancestry of “Illa”, step by step

Step	Language	Word	Meaning
1	Old Catalan	illa	—
2	Vulgar Latin	isula	—
3	Latin	Īnsula	—
4	Proto-Italic	enselā	—

Illa — Etymology, Origin & Word History | Etymology Explorer