Where does “Eliasz” come from?

Eliasz (Polish) comes from Ancient Greek Ἠλίας, from Hebrew אֵלִיָּה — {{l|en|Jah}} is my God.

Ancestry of “Eliasz”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Ἠλίας	Elijah, an Israelite prophet
2	Hebrew	אֵלִיָּה	{{l\|en\|Jah}} is my God