Pope Benedict's first name is Joseph.
His name is Josep Alois Ratzinger.
Maria Ratzinger was the name of Pope Benedict's mother.
Prior to Benedict XVI there were 14 other popes with that name. Pope Benedict X was an antipope and does not count.
Pope Benedict was able to choose a new name when he was elected Pope. Popes usually choose the name of a saint they admire.
The current pope is Pope Francis and his birth name was Jorge.
Pope Emeritus Benedict XVI
Which Pope Benedict? There have been 16 popes by that name.
He chose the name Benedict to honor two individuals he greatly admired - Saint Benedict of Nursia and Pope Benedict XV.
His title and name will be Pope Emeritus Benedict XVI.
There have been 15 popes named Benedict. There was no pope named Benedict X. That name was chosen by an anti-pope who was not a true pope. Pope Benedict XI should have taken the name Benedict X but, due to some confusion, he did not. At the time of Benedict's election, however, this status was not recognized, thus the man the Roman Catholic Church officially considers the tenth true Pope Benedict took the official number XI rather than X. This has advanced the numbering of all subsequent Popes Benedict by one. Popes Benedict XI-XVI are, from an official point of view, the tenth through fifteenth popes by that name.
He will be known as His Holiness Pope Emeritus Benedict XVI.
Pope Benedict was named Theophylactus at birth.