The last name of Mary, the mother of Jesus, is not explicitly mentioned in the Bible, as last names were not commonly used in that time. In ancient Jewish culture, people were often identified by their father’s name or their place of origin.
Mary is typically referred to as Mary of Nazareth or Mary, daughter of Joachim (according to tradition, as her father’s name was Joachim). In the New Testament, she is often referred to in relation to her son, Jesus, as Mary, mother of Jesus.
In Christian tradition, there isn’t a “last name” in the modern sense, but she is sometimes referred to by the town she came from (Nazareth) or in relation to her son.