Where does “Helene” come from?

Helene comes from French Hélène, from Latin Helena, from Ancient Greek Ἑλένη, of uncertain ultimate origin.

Ancestry of “Helene”, step by step

Step	Language	Word	Meaning
1	French	Hélène	—
2	Latin	Helena	—
3	Ancient Greek	ἑλένη	torch, firebrand; corposant, St. Elmo's fire;...
4	Proto-Indo-European	swel-	to smolder; burn; scorch; beam, board, frame,...

Helene — Etymology, Origin & Word History | Etymology Explorer