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,
Eh. If “elvish” is good enough for the Merton Professor of English at Oxford University then it’s good enough for me, at least when referring to members of the race of people he created for his literary works.
Quod Erat Demonstrandum