A person who is elected pope (Bishop of Rome) does not have to change his name, but many have done so. It is his decision, and the new name is normally announced to the cardinals when he accepts election.
A new Pope may choose whatever name he pleases. I don't think this is usually done out of respect for the first Pope.
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 pope chooses his name or may even wish to keep his birth name. It is not required for him to choose a new name.
No, they do not choose from a list. They may choose a name of a previous pope or choose a new name such as Pope John Paul I did.
The newly elected pope can choose to use his birth name or he may choose to use a regnal name.
"They" did not change the name of the new pope, When elected, the new pope has the choice of keeping his Christian name or choosing a regnal name that he wishes to be known as while serving. When Christ named Simon as the first pope he changed his name to Peter. After Peter, the next pope to choose a new name was Pope John II who was elected in the year 533. His given name was Mercurius and he did not think it proper for a Catholic pope to be named for a pagan Roman god - Mercury.
Mostly, the new pope should choose his name from the old name pope. The Cardinal and Bishop would not agree if that would be the case.
We will not know until the current pope dies and the Cardinals choose a new pope in a secret conclave.
His name as pope is just Benedict XVI. Popes do not have last names when they become pope.
He did not want people to think the pope had the power to choose who was emperor.
He did not want people to think the pope had the power to choose who was emperor.
Pope John Paul "Changed his name" just before the end of the Conclave of 1978, just after the Cardinals elected him pope and he accepted election. The cardinal from then on is the new pope, and the new pope, by his papal name.