Is there a specific word, or phrase, that describes or denotes the phenomenon of multiple places or objects in an area sharing a specific, usually regional, name or title? The best example present is in the third Pirates of the Caribbean film, which features the town of Shipwreck in Shipwreck Cove of Shipwreck Island.
1 Answer
If it was a different place with the same name, you could use namesake.
Namesake noun A person or thing that has the same name as another: Hugh Capet paved the way for his son and namesake to be crowned king of France; unlike its Scottish namesake, Leven is not by the sea - ODO
In your example, though it might be better to consider saying something along the lines of "... the town of Shipwreck in the eponymous Cove and Island".
Eponymous adjective of, relating to, or being the person or thing for whom or which something is named - M-W