[William Cloud Hicklin]

I'll defer on the linguistics, never my strong suit... none the less, at the time Tolkien wrote the chapter Inglor was the founder of Nargothrond, not just 'some Elf', and I just don't see any indication at all that Gildor was ever conceived as descendant of Finwe.

I suppose that at this early stage, still very much in Hobbit-mode (in fact the break from that trajectory had just occurred, with the conversion of Gandalf into the Black Rider) Tolkien was prepared to be rather careless with elements from the Legendarium. But then again "We are Exiles" etc already establishes a much closer linkage than anything much in The Hobbit.