Sevastiani’s name day is October 24, the feast of Sebastiane the Martyr.
Churches that follow the Old (Julian) Calendar keep the same feast on November 6 of the civil calendar. See everything commemorated on October 24.
The saint behind the name
Sebastiane the Martyr
October 24, Holy Woman, Σεβαστιανή
Sebastiane, according to tradition a disciple of the Apostle Paul, was brought before the governor Sergius at Marcianopolis in the reign of Domitian. She was cast into a furnace and thrown to wild beasts but was preserved unharmed.
Name days: Sevastiani, Sebastiane, Sevasti, Sebastiana
Also celebrating on October 24
These names share the feast, many of them other forms of the same name:
Sebastiane, Sevasti, Sebastiana
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.