Where does “Ἑλλοί” come from?

Ἑλλοί (Ancient Greek) comes from Ancient Greek ἕλλα, from Proto-Hellenic *héllā.

Ancestry of “Ἑλλοί”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ἕλλα	—
2	Proto-Hellenic	*héllā	—

Words derived from “Ἑλλοί”

Every word from Proto-Hellenic *héllā →

Ἑλλοί — Etymology, Origin & Word History | Etymology Explorer