Dave’s name day is November 1, the feast of David of Euboea.
Churches that follow the Old (Julian) Calendar keep the same feast on November 14 of the civil calendar. See everything commemorated on November 1.
The saint behind the name
David of Euboea
November 1, Venerable, Δαβίδ ο εν Ευβοία
Venerable David the Elder was a monk of the sixteenth century who, after years of ascetic struggle and travels in Greece and beyond, settled in the mountains of northern Euboea and founded the monastery of the Transfiguration, known today as the monastery of Saint David.
Also celebrating on November 1
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.