Where does “fau” come from?

fau (Old French) comes from Latin fāgus, from Proto-Italic fāgos, from Proto-Indo-European bʰeh₂ǵos — beech.

fau (Old French): beech

Definitions

Step	Language	Word	Meaning
1	Latin	fāgus	—
2	Proto-Italic	fāgos	—
3	Proto-Indo-European	bʰeh₂ǵos	beech

fau — Etymology, Origin & Word History | Etymology Explorer