Who was Mother Teresa named for?

Mother Teresa's name was changed from her birth name of Agnes Gonxha Bojaxhiu to Sister Teresa when she became a novice in the convent in Ireland, at the age of 18. Sister Teresa's name was changed to Mother Teresa when she became a fully professed Sister. Later, when she started the Missionaries of Charity, she was still called Mother, as she was the Mother Superior, and Foundress of that Order.