Where does “vâ” come from?

vâ (Sicilian) comes from Sicilian a, from Sicilian la, from Vulgar Latin *illa, from Latin illam, from Old Latin olle, from Proto-Indo-European h₂él- — to grow, nourish.

vâ (Sicilian): + a

Definitions

Ancestry of “vâ”, step by step

Step	Language	Word	Meaning
1	Sicilian	a	—
2	Sicilian	la	the
3	Vulgar Latin	*illa	—
4	Latin	illam	accusative feminine singular of ille
5	Old Latin	olle	that; he, that; Archaic form of ille
6	Proto-Indo-European	h₂él-	to grow, nourish

Every word from Proto-Indo-European h₂él- →Every word from Old Latin olle →Every word from Latin illam →