Ah yes, those demon demonyms! Did you know that the inhabitants of the Maltese island of Gozo are Gozitans and the good citizens of the French département of Seine-Saint-Denis (northeast of Paris) are called Séquano-dionysiens? We happen to have a friend who is un blogeur Séquano-dionysien.
Linguists have a name for these terms that describe the inhabitants or natives of a particular place or region: they are called gentilics, although latterly the alternative word demonyms seems to have achieved popularity. And, yes, gentilics are a minefield. People from Cyprus are Cypriots, while the inhabitants of Norway are Norwegians and their language is Norwegian - though mediaeval versions of the language and Norway's pre-Christian gods are Norse.
How can the first-time visitor to Liverpool divine that the inhabitants of the Merseyside city are called Liverpudlians?