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Faelivrin was the glistening springs and fountains of Eithel Ivrin lay at the roots of the Mountains of Shadow, at the source of the mighty river Narog. These waters were under the protection of Ulmo himself, and so they were not only spectacularly beautiful, but also held a power of refreshment and renewal.
Gwindor was an Elf of Nargothrond who was inspired by the waters of Eithel Ivrin. From them, he gave a new name to his beloved Finduilas, calling her Faelivrin, which is interpreted as 'the gleam of the sun on the pools of Ivrin'.