I worked with a couple of guys based in Monaco and since it is a city state I guess it applies, I asked and they said they are called "Monagese" but I see it is spelled Monégasque.

In the article I see the ese is French ending maybe Monagese is the English version of Monégasque, or I misheard.

In Canada there are two cities Saint John, New Brunswick and St. John's Newfoundland I'm not sure what each prefers with each being so closely named. I do know that you never write out St. as Saint for St. John's that's a paddlin'.