There have been 23 popes named John, the most popular name by far.The most popular name historically chosen by the popes is John. No less than 23 popes have taken the papal office under this name.
To which Pope Gregory do you refer? There have been 16.
There are a number of pope names that have been used only once. Peter, the name of the first pope, is one and Francis, the name of the current (2013) pope, is another example.
There has never been a pope from Canada.
A common name for a pope starting with "I" is Pope Innocent. There have been several popes with this name throughout history, with Pope Innocent III being one of the most notable.
No. Pope Francis was the first pope from the New World. There has never been a pope from Canada.
There has not been a Pope Marcellinius but there has been a Pope St. Marcellinus and yes, he was a Catholic pope.
He was the Pope off Calvinism and Protestantism. He was against the catholic Pope. He lived most of his later life in Geneva and led a Protestant reform there, so he is known as the pope of Geneva.
The most 'popular' number in the world has not been recorded.
No, there has never been a pope from Scotland.
No, there has never been a pope from Malta.
No, there has never been a Pope from Ireland.