Where does “ίλη” come from?

ίλη (Greek) comes from Ancient Greek ἴλη, from Proto-Indo-European welH- — to turn, to wind.

ίλη (Greek): squadron

Definitions

Step	Language	Word	Meaning
1	Ancient Greek	ἴλη	band, troop of men; troop of horses, squadron of...
2	Proto-Indo-European	welH-	to turn, to wind

ίλη — Etymology, Origin & Word History | Etymology Explorer