Where does “Եփեսոս” come from?

Եփեսոս (Armenian) comes from Old Armenian Եփեսոս, from Ancient Greek Ἔφεσος, from Luwian Apa-ša.

Ancestry of “Եփեսոս”, step by step

Step	Language	Word	Meaning
1	Old Armenian	Եփեսոս	—
2	Ancient Greek	Ἔφεσος	Ephesus
3	Luwian	Apa-ša	—