Eumenios’s name day is May 23, the feast of Eumenios of Crete.
Churches that follow the Old (Julian) Calendar keep the same feast on June 5 of the civil calendar. See everything commemorated on May 23.
The saint behind the name
Eumenios of Crete
May 23, Venerable, Ευμένιος ο Νέος (Σαριδάκης)
Eumenios Saridakis was born in Crete in 1931 and became a monk as a youth. Contracting leprosy, he was sent to the hospital for infectious diseases in Athens, where, after his healing, he chose to remain for the rest of his life as priest and comforter of the sick.
Also celebrating on May 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.