• Surname is the family name or the last name of a person, whereas first name is the unique name given to a person at birth, also referred to as his Christian name.• First name is the distinguishing feature of a person in his family, though his friends may lovingly refer to him with his surnames.urname. A surname is the fixed name or last name or family name that is common in the names of all family members, and is shared by all. This is very old, and no one in the family really knows about the origin of this name.