[Mithadan]

To the extent that it might be helpful, I have the 2001 Sindarin Lexicon published by The Tolkien Society. There, Rog is of course defined as "demon". Ro- is, however, defined as "high". Gae- and goe- are defined as fear or terror. Gol (circumflex over the o) is wise or magical and goll is wise. One definition for gur (circumflex over the u) is heart.

I don't have BoLT 2 with me and I can't recall the nature of Rog or his people. Were they not smiths or miners? If so Raud raises a possibility as it is defined as "metal" (sometimes modified in names to rod).

I recognize everyone's resistance to "creating" a new name for Rog or even devising an explanation for his name. But I would hate to leave out Rog (the character) simply because we don't feel his name is proper Elvish.