Where does “festa” come from?

festa (Latin) comes from Latin festum, from Latin fēstus, from Proto-Italic fēstos.

Ancestry of “festa”, step by step

Step	Language	Word	Meaning
1	Latin	festum	a holiday, festival; a banquet, feast
2	Latin	fēstus	—
3	Proto-Italic	fēstos	—

festa — Etymology, Origin & Word History | Etymology Explorer