Names can be copywritten for use in a specific field or medium.
For example, let's say your parents have a sick sense of humor and decided to name you Billy Joel, after the singer. Because Billy Joel the singer has copywritten his name, you could not pursue a career in music (it doesn't matter what genre, classical, rap, techno, etc) without encountering tremendous legal pressure (or even a mandate) to change your name.
Another example is Apple. When Apple computer first started up and named themselves Apple Computer, Apple Records (I think they only reason they're still around is because they signed the Beatles) threw a hissy fit. Never mind that they were in different industries. So Apple Computer agreed never to advertize the musical capabilities of their machines. Keep in mind that this was back in the Apple I days, when they were still a small company without multi-million dollar resources, and before anybody imagined the computer music revolution that lay ahead.
It might be best to avoid naming your game after part of a book or other fantasy series, especially if you're deriving inspiration from it.
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