Theofilos’s name day is October 2, the feast of Theophilos the Confessor.
Churches that follow the Old (Julian) Calendar keep the same feast on October 15 of the civil calendar. See everything commemorated on October 2.
The saint behind the name
Theophilos the Confessor
October 2, Venerable, Θεόφιλος ο Ομολογητής
Theophilos entered monastic life as a youth under the elder Stephen on Mount Selenteia and grew in obedience and prayer. During the iconoclast persecution of Leo the Isaurian he boldly defended the veneration of the holy icons.
Name days: Theophilos, Theofilos, Theophilus, Theophilia
Also celebrating on October 2
These names share the feast, many of them other forms of the same name:
Theophilos, Theophilus, Theophilia
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.