: In addition to what Martin and Beren have written, I'll toss in a tidbit that might help. In the Anglo-Saxon poem Judith, the heroine is described as "aelfscinu"-elf shining. Some commentators have taken that as purely a reference to her beauty, but others have argued for an otherworldly sense to the term, which goes along with what Beren and Martin reported about the elves. I can look further into this, or can look for other aelf- compounds and descriptions if you're interested.