Sidora’s name day is May 1, the feast of Isidora the Fool-for-Christ.
Churches that follow the Old (Julian) Calendar keep the same feast on May 14 of the civil calendar. See everything commemorated on May 1.
The saint behind the name
Isidora the Fool-for-Christ
May 1, Holy Woman, Ισιδώρα
Isidora was a nun of the women's monastery of Tabennisi in Egypt in the fourth century. She took the lowliest tasks of the kitchen, ate only scraps, and let the sisters mock her as a simpleton, bearing everything without complaint.
Also celebrating on May 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.