Westernesse
From Tolkien Gateway
Westernesse was a name in the Common Speech for the Isle of Númenor.
Etymology
The ending ess (also in Elfinesse) was used in romance literature for fictional lands that had partly francized names.
Inspiration
in the 13 century chivalric romance King Horn, Westernesse is a kingdom ruled by "King Ailmar" and it is reached by ship by Horn.