Where does “Helvétie” come from?

Helvétie (French) comes from Latin Helvetia, from Latin helvetius, from Gaulish etu- — terrain, grassland.

Ancestry of “Helvétie”, step by step

Step	Language	Word	Meaning
1	Latin	Helvetia	Switzerland
2	Latin	helvetius	—
3	Gaulish	etu-	terrain, grassland

Helvétie — Etymology, Origin & Word History | Etymology Explorer