Board Thread:Suggestions forum/@comment-25754873-20151231212941/@comment-26149161-20160102134023

Yes. The Sindar weren't Calaquendi (I don't think they were Moriquendi either, but that's another story). However, the word "Calaquendi" eventually fell out of use, and "High Elf" came to mean any Elf who had been in or was descended from a Beleriandic elf (excluding the wandering Silvans and the Laiquendi). The Sindar would have liked to be called High Elves, as it is an imporvement in rank, as long as it didn't suggest connection with the Noldor. In fact, by the Third Age, the elves were pretty much best buddys, so the Sindar might not have cared.