Where does “josier” come from?

josier (Old French) comes from Vulgar Latin gusia, from Late Latin geusiae, from Gaulish geusi — to pour.

Ancestry of “josier”, step by step

josier traces back through two separate lines of ancestry.

via Vulgar Latin gusia

Step	Language	Word	Meaning
1	Vulgar Latin	gusia	—
2	Late Latin	geusiae	throat, maw
3	Gaulish	geusi	to pour

via Latin gausia

Step	Language	Word	Meaning
1	Latin	gausia	—

Every word from Gaulish geusi →Every word from Late Latin geusiae →Every word from Vulgar Latin gusia →