I was discussing my current favorite topic, the papacy, with a family member of mine. He told me that the name Peter could not be taken by any Pope as his Papal name. I have never heard this, anyone out there have an answer for me?
There is no rule against it. In theory,a pope could take the name Peter II.
However, there has been a longstanding custom against it. I guess that most popes simply feel that taking the name of Peter would be the ultimate in chutzpah, because of our respect for the original pope.
Plus, if one believes in the prophecies of Malachy, a pope taking the name of Peter would be a bad sign!