[Galin]

I was going to try and suggest a place-name 'explanation' too (stretch!), but the patronymic is still the prime choice in my book. Tolkien could be quite creative if he really wanted to wriggle out of something, but (correct me if I'm wrong) he had not published that an Elf named Inglor was Felagund (in any case).

Readers got to know 'Inglor Felagund' through what are essentially drafts, and the texts in PE17 show us once again that Tolkien could be quite fluid with his nomenclature.