Where does “Կիւրեղ” come from?

Կիւրեղ (Old Armenian) comes from Ancient Greek Κύριλλος, from Ancient Greek κῡ́ριος — main; major; primary; principal.

Ancestry of “Կիւրեղ”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Κύριλλος	—
2	Ancient Greek	κῡ́ριος	main; major; primary; principal