Francis, Francisco or both?

Hi you all!

Because there is San Francisco city, I've thought that one person name was named Francisco. Now that there is a new Pope, I saw him called Pope Francis. So, what's the right word?
Thanks!

[Good job.  The same name may have many forms.  'John' in German is 'Johann'.  The Russian form is 'Ivan'.  Pope John Paul II once recited to a crowd all the different forms of his name in different languages.]