Where does “sè” come from?

sè (Sicilian) comes from Latin sic est, from Latin sic, from Latin sice, from Latin sī, from Proto-Italic sei, from Proto-Indo-European só — this; that.

sè (Sicilian): yes

Definitions

Ancestry of “sè”, step by step

Step	Language	Word	Meaning
1	Latin	sic est	thus is
2	Latin	sic	thus, so, like this, in this way
3	Latin	sice	—
4	Latin	sī	if, supposing that
5	Proto-Italic	sei	so, thus
6	Proto-Indo-European	só	this; that

Every word from Proto-Indo-European só →Every word from Proto-Italic sei →Every word from Latin sī →