[Bêthberry]

Well, had he wanted to include a hidden reference to his daughter, why not give the wise old elf woman in Lorien the name Ioreth? And give 'Galadriel' to the garrulous one. *insert joking smiley here*

But an interesting thought: do we know if Tolkien included any other hidden reference to a family member? Can we trace names of Tolkien's sons in LotR? of Edith? I could see doing this in The Hobbit, where discovery might increase children's glee, but why do it in LotR for just one child, particularly since the Letters suggest that it was Christopher who was the favoured child.