Popes do not choose a surname when elected to the papacy.
Before elected, though, Benedict XVI's name was Joseph Ratzinger.
Pope Benedict XVI was born Josef Alois Ratzinger.
His given names is Josef Alois Ratzinger.
Joseph Ratzinger
The Black Pope's birth name is Shelly Pope.
Alece Pope's birth name is Charlotte Alece Pope.
Dennis Pope's birth name is Dennis Allen Pope.
Edwin Pope's birth name is John Edwin Pope.
Everett Pope's birth name is Everett Parker Pope.
Katherine Pope's birth name is Katherine Collins Pope.
Marquez Pope's birth name is Marquez Phillips Pope.
Tommy Pope's birth name is Thomas Elbert Pope.
Cassadee Pope's birth name is Cassadee Blake Pope.
Eddie Pope's birth name is George Edward Pope.
Julie Pope's birth name is Julie Smith.
Lynne Pope's birth name is Patricia Lynne Parker.