@Boaz,
I'm sorry if you think it's personal, my seeming "lack of interest in your question", because it's not that.
My original thought on the subject was Elrond, who was called (rather than named) an elf-friend when they first passed through Rivendell on the way out, (The last homely house west of the mountains and east of the sea.), it seemed rather odd to call him thus, as he is half-elven, which I accept was too complicated for young readers perhaps.
But my main reason for not posting that was that I'm just too busy at the moment to find a new question anyway.
My other thought was that, chronologically, maybe Strider was named an Elf-friend before Bilbo, even if it was perhaps written about, I think, in the LOTR prologue, and so read after Bilbo's naming. Maybe even calling Elendil an elf-friend (or even someone else in Numenor) occurs in the prologue, and certainly in the Silmarillion. So chronologically beating everyone.
Anyway. I didn't want you to think that I was snubbing you. I probably won't be able to really contribute, other than silly comments like this, and jokes elsewhere, until September, now.
And well done HB.