Where does “sancio” come from?

sancio (Latin) comes from Proto-Italic sankjō, from Proto-Indo-European sh₂nékti ~ sh₂nkénti, from Proto-Indo-European seh₂k- — sacred.

Ancestry of “sancio”, step by step

Step	Language	Word	Meaning
1	Proto-Italic	sankjō	—
2	Proto-Indo-European	sh₂nékti ~ sh₂nkénti	—
3	Proto-Indo-European	seh₂k-	sacred

sancio — Etymology, Origin & Word History | Etymology Explorer