His title was Prefect of the Congregation for the Doctrine of the Faith and, as well, Dean of the College of Cardinals.
Josef Alois Ratzinger
Joseph Alois Ratzinger
Karol Woyjtila
Cardinal Ratzinger
Karol Wojtyła
Benedict Arnold
Prior to Benedict XVI there were 14 other popes with that name. Pope Benedict X was an antipope and does not count.
Catholic AnswerIf you are talking about St. Benedict of Nursia, there is very little know about him other than his Rule (The Rule of St. Benedict), and what Pope St. Gregory the Great describes about him in his Dialogues. But there is no indication that he changed his name when he became a hermit, so it is safe to assume that his name was Benedict, and his sister's name was Scholastica.
Joseph Alois Ratzinger
His name was Cardinal Joseph Alois Ratzinger.
Joseph Alois Ratzinger was his original name.
None, Benedict XVI is the first.
Joseph Alois Ratzinger was his original name.
Ed Benedict's birth name is Edward A. Benedict.
Benedict Schillemans's birth name is Benedict Schillemans.
Colleen Benedict's birth name is Colleen Marie Benedict.
Max Benedict's birth name is Max Peter Benedict.