The people of Monaco are called Monagasques.Doesn't really
mean anything, except to them.

Means something to me: the inhabitants of Monaco (the principality and the city). It's pretty straight forward (Frenchish) adjectival form of Monaco. The dialect spoken there as well as the rest of that eastern part of the French Riviera, is rather close to the Gallo-Italian dialects of Liguria across the Italian border. (In fact, the Monagasque royal family's name is Grimaldi and they originally were from Liguria and under the control of the Republic of Genoa.)

As for the folks from Wagga Wagga, I suppose if I had to coin a term I would go with Corvopolitanian (from the Modern Latin name for the city Corvopolitanus). Wagga and corvus mean 'crow' in Wiradjun and Latin respectively.

Ceci n'est pas un seing.