Where does “facus” come from?

facus (Vulgar Latin) comes from Latin fascis, from Latin fasciō, from Latin fascia, from Proto-Indo-European bʰasḱ- — bundle, heap, load.

Ancestry of “facus”, step by step

Step	Language	Word	Meaning
1	Latin	fascis	A faggot, fascine; bundle, packet, package,...
2	Latin	fasciō	—
3	Latin	fascia	band, bandage, swathe, strip, ribbon; necktie
4	Proto-Indo-European	bʰasḱ-	bundle, heap, load

facus — Etymology, Origin & Word History | Etymology Explorer