Morning Star is actually a title of Mary, and the name of a summer camp run by nuns. - Edit 1
Before modification by Cannoli at 26/03/2017 05:21:46 PM
There are also the numerous professions of faith which are, yes, usually in Elven ( A Elbereth Gilthoniel silivren penna miriel... ), but mentions are made of the Star of Earendil (a corruption of the Anglo-Saxon name for the morning star; this is of course somewhat ironic given its Luciferan connections) and the light shining in the darkness, etc.
Tolkein being a pre-Vatican 2 Catholic, I'm pretty sure that was what he had in mind. IDK where the Lucifer thing comes from, I thought he was the Evening Star, but if the prots fucked that up too, it's understandable that he is better known in popular culture.