R: RANUIN, or ruin with Na, reversed, inside it, is the ?Ainu? incarnation of months. I'm not sure how well he fits the puzzle, though - there's no indication that sodium is 'eaten' or reversed, and I don't think he has an Other Name.
More certainly, for E: EDENNIL, or den + nile, a name for Finrod, used presumably by Andreth (it's from the Athrabeth). 'Friend of Men' in Sindarin, apparently, I guess from EDAIN+NDIL with some mutations or something.
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