Where does “geant” come from?

geant (Old French) comes from Latin gigantem, from Ancient Greek Γίγας, from Ancient Greek Γίγᾱς.

Ancestry of “geant”, step by step

geant traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Latin	gigantem	accusative singular of gigāns
2	Ancient Greek	Γίγας	one of the Gigantes; a Gigas
3	Ancient Greek	Γίγᾱς	—

Step	Language	Word	Meaning
1	Vulgar Latin	gagas	—
2	Latin	gigant-	—
3	Ancient Greek	γίγας	giant; plural gigantes: giant