Miltiades’s name day is April 10, the feast of Miltiades of Rome.
Churches that follow the Old (Julian) Calendar keep the same feast on April 23 of the civil calendar. See everything commemorated on April 10.
The saint behind the name
Miltiades of Rome
April 10, Hierarch, Μιλτιάδης Πάπας Ρώμης
Miltiades was Bishop of Rome in the early fourth century, in the years when the persecutions ended and the emperor Constantine granted freedom to the Church. He presided over a synod at Rome that examined the Donatist dispute in Africa.
Also celebrating on April 10
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.