Pope Urban IX sounds nice...
Boniface X i dont know... it fell out of use during medieval times and it is associated with some nasty guys (like Boniface VII) who were a disgrace to the Holy See...
Oops. "St. Urbain" is the heart of the Jewish g/h/e/t/t/o neighbourhood in Montreal, made famous by "St. Urbain's Horseman" by Mordechai Richler, a famous Canadian writer. That was a Canadian in-joke, not a real suggestion.
St. Boniface is a neighbourhood in Winnipeg, and the saint was prominent among the Métis and the French in western Canada. I don't believe that he was particularly venerated in Québec, where any hypothetical Canadian Pope would come from. So, not exactly a joke, but not serious either.