Theonas’s name day is January 5, the feast of Theonas the Martyr.
Churches that follow the Old (Julian) Calendar keep the same feast on January 18 of the civil calendar. See everything commemorated on January 5.
The saint behind the name
Theonas the Martyr
January 5, Martyr, Θεωνάς
St. Theonas was a sorcerer who, tradition relates, was sent to poison the Hieromartyr Theopemptos of Nicomedia during the persecution of Diocletian. Seeing the bishop unharmed, he believed in Christ and was baptized.
Name days: Theonas
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.