Loreley is the name of a rock at the river Rhein in Germany. The name Loreley is composed out of two words. The second part has it's roots in the celtic word Ley
which denotes the schist rock in this region (Schiefer, ardoise). The first name presumably is rooted in the old german (altdeutsch) word lorlen
which means rush or murmur (fr: gazouiller).
As the Rhein is very dangerous in that region, many accidents have occurred and throughout the centuries many stories and songs have come up.
Heinrich Heine, inspired by this topic, in 1824 wrote the poem Die Lore-Ley
which might be the most known german poem throughout the world. In 1837 Friedrich Silcher wrote the music for this.
When I visited Japan for the first time in my life in 1984, at an evening with japanese friends, after one or two Sake, they started singing and asked me to sing a german song as well. Now I have to admit, that to my big shame I did not know any german song. So one of my japanese friends then started to sing Heinrich Heine's LoreLey song: in german and all the six verses without a mistake!
On that evening I "lost my face", and according to the old japanese tradition I should have commited suicide immediately just there. But luckily this happened in 1984, and my hosts were very generous with me uncultivated european without honour --- they still speak with me nowadays.Summary:
in Loreley is correct!