He didn't have to change his name. He could have kept his birth name but it has been the custom for well over 1000 years to take on a new name at election. Remember, Christ changed Simon's name to Peter when he appointed him as the first pope.
His title and name will be Pope Emeritus Benedict XVI.
He is known as Pope Emeritus Benedict XVI.
Prior to Benedict XVI there were 14 other popes with that name. Pope Benedict X was an antipope and does not count.
Pope Benedict XVI was born Joseph Alois Ratzinger
Actually, he is now Pope Emeritus Benedict XVI.
Josef Ratzinger, Senior, was the father of Pope Benedict XVI.
Pope Benedict XVI founded the Communino.
Pope Benedict's first name is Joseph.
Pope Benedict XVI was the 265th pope.
Pope Emeritus Benedict XVI
Maria Ratzinger was the name of Pope Benedict's mother.
Pope Benedict XVI was the 265th pope.