Just FYI: “elfin” means small of stature, short and slender.
In the context of Tolkien, the proper term would be “elven”. Liv is a lot of things, but elfin is not one of them.
I do not find the word "elven" in my "Webster's Third International Dictionary (unabridged)."
However, I do find "elfin," which has several slightly different meanings, besides "small of stature, short and slender," and which is defined as follows:
1a: of, relating to, or produced by an elf; b: of or relating to a small child or to childhood; 2a: small, slight, and delicately made or proportioned: DWARFISH; b: quick, agile, and delicate; c: good-naturedly or slyly mischievous: PLAYFUL, PUCKISH; d: having an otherworldly, unearthly, or magical quality: FEY
I also find "elfish," which is defined as follows:
1: of or relating to an elf: resembling an elf: ELFIN.
I was thus using the word in its primary standard meanings and/or as a synonym for "elfish."
Q.E.D.
Regards,