Joseph Alois Ratzinger was his original name.
Prior to Benedict XVI there were 14 other popes with that name. Pope Benedict X was an antipope and does not count.
Joseph Alois Ratzinger
Saul's name before becoming a Christian was Saul. Afterwards he changed it to Paul.
His name was Cardinal Joseph Alois Ratzinger.
None, Benedict XVI is the first.
Joseph Alois Ratzinger was his original name.
Benedict Schillemans's birth name is Benedict Schillemans.
Ed Benedict's birth name is Edward A. Benedict.
Colleen Benedict's birth name is Colleen Marie Benedict.
Max Benedict's birth name is Max Peter Benedict.
Rob Benedict's birth name is Robert Patrick Benedict.
Vicki Benedict's birth name is Victoria June Benedict.