The city of New York is often called Novum Eboracum in Latin. Let us ignore other options for the purpose of this question; I just want to understand city names with two or more words through an example.
Many city names have associated adjectives: Roma > Romanus, Carthago > Carthaginiensis, and so on. What would the adjective for New York, Novum Eboracum, be? I want New York to be distinct from York, Eboracum, if at all possible, so a plain Eboracensis is not great if there are options.
The adjective can probably be used as a demonym (a noun for "a person living in New York") or a general adjective (for expressing one's love of New York style pizza). With cities this is often the case in my experience.