Most people named Markos keep their name day on April 25, the feast of Mark the Evangelist. The Orthodox calendar has 1 other feast for the name.
Every feast on which Markos is celebrated
| New Calendar | Feast | Old Calendar (civil date) |
|---|---|---|
| March 29 | Mark, Bishop of Arethusa | April 11 |
| April 25 | Mark the Evangelist | May 8 |
The saints behind the name

Mark the Evangelist
April 25, Apostle, Μάρκος ο Ευαγγελιστής
St. Mark the Evangelist, one of the Seventy, was a companion of the Apostles Peter and Paul, and wrote the second Gospel, which ancient tradition holds preserves the preaching of Peter. He labored in the spread of the Gospel from Jerusalem to Rome, and is honored as the founder of the Church of Alexandria in Egypt.

Mark, Bishop of Arethusa
March 29, Martyr, Μάρκος
St. Mark was Bishop of Arethusa in Syria in the fourth century. In the days of Constantine he had destroyed a pagan temple and built up the Church; when Julian the Apostate restored idolatry, the aged bishop was seized by the pagans of the city and subjected to prolonged and vicious torments, which he endured with such meekness that even his tormentors marveled.
Also celebrating on April 25
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.