Merkouris’s name day is November 25, the feast of Mercurius the Great Martyr.
Churches that follow the Old (Julian) Calendar keep the same feast on December 8 of the civil calendar. See everything commemorated on November 25.
The saint behind the name
Mercurius the Great Martyr
November 25, Martyr, Μερκούριος ο Μεγαλομάρτυς
Saint Mercurius was a Scythian officer in the Roman army who, according to tradition, was granted victory in battle by an angel and afterwards confessed Christ before the Emperor Decius. He was subjected to cruel tortures and beheaded at Caesarea in Cappadocia.
Name days: Merkourios, Mercurius, Mercurios, Merkouris
Also celebrating on November 25
These names share the feast, many of them other forms of the same name:
Merkourios, Mercurius, Mercurios
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.