Thalassios’s name day is May 20, the feast of Thalassios the Libyan.
Churches that follow the Old (Julian) Calendar keep the same feast on June 2 of the civil calendar. See everything commemorated on May 20.
The saint behind the name
Thalassios the Libyan
May 20, Venerable, Θαλάσσιος
Thalassios was abbot of a monastery in Libya in the seventh century and a correspondent of Saint Maximos the Confessor, who dedicated several works to him. His own Four Centuries on love, self-control and the life of the mind are included in the Philokalia.
Name days: Thalassios
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.