Michaela’s name day is November 8, the feast of the Synaxis of Archangels Michael and Gabriel.
Churches that follow the Old (Julian) Calendar keep the same feast on November 21 of the civil calendar. See everything commemorated on November 8.
The saint behind the name

Synaxis of Archangels Michael and Gabriel
November 8, Great Feast, Αρχάγγελοι Μιχαήλ και Γαβριήλ
On November 8 the Church celebrates the Synaxis of the Archangels Michael and Gabriel together with all the Bodiless Powers of heaven. Michael, whose name asks Who is like God, is honored as the chief commander of the heavenly hosts who stood firm when the rebellious angels fell; Gabriel is the messenger who announced the Incarnation to the Theotokos.
Name days: Michail, Michalis, Michales, Mike, Miguel, Michele, Mikes, Gabriel, Gavriil, Angelos, Angeli, Angelo, Michael, Aggelos, Stamatis, Stamatios, Taxiarchis, Raphael, Rafail, Michaela, Gabriella, Gavriella, Gavriela, Angeliki, Aggeliki, Angela, Angelina, Stamatia, Stamatina, Matina, Rafaela
Also celebrating on November 8
These names share the feast, many of them other forms of the same name:
Michail, Michalis, Michales, Mike, Miguel, Michele, Mikes, Gabriel, Gavriil, Angelos, Angeli, Angelo, Michael, Aggelos, Stamatis, Stamatios, Taxiarchis, Raphael, Rafail, Gabriella, Gavriella, Gavriela, Angeliki, Aggeliki, Angela, Angelina, Stamatia, Stamatina, Matina, Rafaela
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.