Where does “Irene” come from?

Irene comes from French Irène, derived from Ancient Greek εἰρήνη (eirḗnē, "peace"), ultimately from Proto-Indo-European werh₁-.

Ancestry of “Irene”, step by step

Step	Language	Word	Meaning
1	French	Irène	—
2	Ancient Greek	Εἰρήνη	peace
3	Ancient Greek	εἰρήνη	peace
4	Ancient Greek	εἴρω	I tie, join, fasten, string together; I insert;...
5	Proto-Hellenic	wéřřō	to say, to tell
6	Proto-Indo-European	wéryeti	to be saying
7	Proto-Indo-European	werh₁-	to speak, say

Irene — Etymology, Origin & Word History | Etymology Explorer