Answer:
The word "Santeria" is in reference to Catholic Saints, which are not associated with the Orisha in West Africa. Yangi stone was not available in the new world, so Eshu started being made out of cement filled with items; the praise name Elegbarra became "Elleggua" in Santeria. The river Orisha Yemoja (which means "Mother of the Fishes") became Yemaya, Orisha of all the surface of the ocean. Oshun became Orisha of all the rivers. Both Irunmole and Orisha were called Orisha. There are many other ways as well.