Silvester’s name day is January 2, the feast of Sylvester of Rome.
Churches that follow the Old (Julian) Calendar keep the same feast on January 15 of the civil calendar. See everything commemorated on January 2.
The saint behind the name
Sylvester of Rome
January 2, Hierarch, Σίλβεστρος
St. Sylvester was Bishop of Rome in the first half of the fourth century, during the reign of St. Constantine the Great, when the Church emerged from persecution. The First Ecumenical Council at Nicaea was held during his episcopate, and he was represented there by his legates.
Name days: Sylvester, Silvester, Silvestros, Sylvestros
Also celebrating on January 2
These names share the feast, many of them other forms of the same name:
Sylvester, Silvestros, Sylvestros
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.