Where does “Ηλίας” come from?

Ηλίας (Greek) comes from Ancient Greek Ἠλίᾱς, from Hebrew אֱלִיָּה.

Ancestry of “Ηλίας”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Ἠλίᾱς	Elijah, an Israelite prophet
2	Hebrew	אֱלִיָּה	—