Domniki’s name day is January 8, the feast of Domnika of Constantinople.
Churches that follow the Old (Julian) Calendar keep the same feast on January 21 of the civil calendar. See everything commemorated on January 8.
The saint behind the name
Domnika of Constantinople
January 8, Holy Woman, Δομνίκη
St. Domnika came from Carthage to Constantinople in the late fourth century, where she was baptized by the Patriarch Nektarios. She founded a convent in the city and became famous for her ascetic life and gift of prophecy.
Also celebrating on January 8
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.