Where does “étain” come from?

étain (French) comes from Middle French estain, from Old French estain, from Latin stannum, from Proto-Celtic *stagnom.

étain (French): tin

Definitions

Step	Language	Word	Meaning
1	Middle French	estain	tin
2	Old French	estain	tin
3	Latin	stannum	an alloy of silver and lead; tin
4	Proto-Celtic	*stagnom	—

étain — Etymology, Origin & Word History | Etymology Explorer