Aglaia’s name day is December 19, the feast of Aglaia of Rome.
Churches that follow the Old (Julian) Calendar keep the same feast on January 1 of the civil calendar. See everything commemorated on December 19.
The saint behind the name
Aglaia of Rome
December 19, Holy Woman, Αγλαΐα η Ρωμαία
Righteous Aglaia was a wealthy Roman noblewoman of the early fourth century. Having sent her servant Boniface to the East to bring back relics of the martyrs, she received instead his own body, for he had confessed Christ and been martyred at Tarsus.
Also celebrating on December 19
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.