In this instance, I took the name "caleuche" from Alistair Reynolds' "Chasm City". One of the threads of the story covers a slow boat interstellar flight from the Solar System to 61 Cygni by a flotilla of ships. Rumors among the crews of the ships have it that another ship is just behind the flotilla, dark and dead. They gave it the name "Caleuche", after a ghost ship supposedly sailing off the coast of Chile.