Silouan’s name day is September 24, the feast of Silouan the Athonite.
Churches that follow the Old (Julian) Calendar keep the same feast on October 7 of the civil calendar. See everything commemorated on September 24.
The saint behind the name
Silouan the Athonite
September 24, Venerable, Σιλουανός ο Αθωνίτης
St. Silouan was born a Russian peasant in 1866 and came to the monastery of St. Panteleimon on Mount Athos as a young man, where he lived for nearly fifty years in obedience and prayer. He was granted a vision of the living Christ and taught, from long struggle with despair, the word he received: keep thy mind in hell and despair not.
Also celebrating on September 24
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.