Ireneos’s name day is August 23, the feast of Irenaeus of Lyons.
Churches that follow the Old (Julian) Calendar keep the same feast on September 5 of the civil calendar. See everything commemorated on August 23.
The saint behind the name
Irenaeus of Lyons
August 23, Hierarch, Ειρηναίος Λουγδούνου
Saint Irenaeus was born in Smyrna and heard Saint Polycarp in his youth. He became bishop of Lyons in Gaul, where he wrote his great work Against Heresies in defence of the apostolic faith and worked for peace between the churches.
Also celebrating on August 23
These names share the feast, many of them other forms of the same name:
What to say on a name day
The Greek wish is Χρόνια Πολλά (Chronia Polla), “many years.” A call or a short message on the day is what people remember. See name day wishes you can send and what a name day is.