During the time of St. Lucy there were no last names used. That did not originate for many centuries after she died.
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The last name Saint originated from France. This name was often used as a middle name during the Middle Ages. The meaning of Saint is holy.
During the time of Saint Brigid there were no last names.
Saint
My last name's Maroun too. It doesn't technically mean anything. There was a a saint called Saint Maroun in the 5th century.
Therese of Lisieux's family name was Martin.Therese of Lisieux's last name was Martin.
Saint Aaron of Brettany lived in the 6th century long before people assumed a last name. If he had a middle name, it is not recorded.
Saint Tarcisius is not traditionally known to have a last name, as he is often simply referred to as Tarcisius or Tarcisius of Rome.
Last names were not used at the time she lived.
Saint Nicholas is often referred to as Saint Nicholas of Myra or Nicholas of Bari.
Saint Stephen's full name was Stephen the Protomartyr.
Last names were not used at the time that Valentine lived.