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.
the least popular girl name in the world is Timber.
as a female name is one of the least popular names
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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.
Pope Gregory I had at least one brother but his name and fate are unknown.
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The Black Pope's birth name is Shelly Pope.
Since Pope Francis is the first and only pope by that name, there is no need for a number after his name. If a pope in the future also decides to take the name Francis, he will become Pope Francis II and then the original Pope Francis will become Pope Francis I.