I think Gandalf is obviously the Pope. Think about it. The White Wizard? At first I thought he might be St. Dominic, but then I thought he must be the Pope because I realized where the Pope stays during the summer! Or I suppose he could be both St. Dominic and the Pope. He is sort of a multi purpose character in the imagination of Tolkien’s Catholic mind.
The other wizards are clearly named after different kinds of saints and bishops as well.
I just thought that was pretty cool. More later in a Tolkien Minute series.