Justus’s name day is February 15, the feast of Chloe, Crispus, Justus and Titius of Corinth.
Churches that follow the Old (Julian) Calendar keep the same feast on February 28 of the civil calendar. See everything commemorated on February 15.
The saint behind the name
Chloe, Crispus, Justus and Titius of Corinth
February 15, Saint, Χλόη, Κρίσπος, Ιούστος και Τίτιος
Chloe, Crispus, Justus and Titius are mentioned in the New Testament as members of the church of Corinth and companions of the Apostle Paul: Crispus was ruler of the synagogue whom Paul baptised, Titius Justus opened his house next to it, and Chloe's household sent word to Paul about the divisions in the community.
Also celebrating on February 15
These names share the feast, many of them other forms of the same name:
Krispos, Crispus, Ioustos, Chloe, Chloi
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.