The Angel Gabriel appeared to Mary, The Blessed Virgin and said to Her, a young woman, “Blessed are you Mary you are going to give birth to the Saviour and you must name Him Jesus”. This means Saviour.
Mary replied to the Angel “How CAN THIS BE, SINCE I HAVE NOT BEEN WITH A MAN?”. The Angel said “You will conceive by the Holy Spirit”. Mary’s great acceptance was ”Let it be done according to thy word”.