Here's a serious lore question; Does the entire world LotC is set in have a name? If we sailed from all the realms to the next, doesn't that really mean it's all the same world, or universe at least?
Okay... But does the whole 'world' or universe have a name? If not, shouldn't it have one, for the convenient sake of literature and such? If you were writing about the entire world, it seems a bit silly to say 'Aegis and Asulon and Elysium and Anthos'.