Where does “gaiet” come from?

gaiet (Old French) comes from Latin gagates, from Ancient Greek Γαγάτης, from Ancient Greek Γάγας — a town and river in Lycia.

Ancestry of “gaiet”, step by step

Step	Language	Word	Meaning
1	Latin	gagates	A hard, black asphalt; variety of lignite; jet,...
2	Ancient Greek	Γαγάτης	lignite; jet; lignite, jet; lignite; jet;...
3	Ancient Greek	Γάγας	a town and river in Lycia

gaiet — Etymology, Origin & Word History | Etymology Explorer