Where does “Kirill” come from?

Kirill (English) comes from Russian Кири́лл, from Ancient Greek Κύριλλος, from Ancient Greek κῡ́ριος.

Ancestry of “Kirill”, step by step

Step	Language	Word	Meaning
1	Russian	Кири́лл	—
2	Ancient Greek	Κύριλλος	—
3	Ancient Greek	κῡ́ριος	—

Kirill — Etymology, Origin & Word History | Etymology Explorer