Where does “gigās” come from?

gigās (Latin) comes from Ancient Greek Γίγας, from Ancient Greek Γίγᾱς.

Ancestry of “gigās”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Γίγας	one of the Gigantes; a Gigas
2	Ancient Greek	Γίγᾱς	—

gigās — Etymology, Origin & Word History | Etymology Explorer