Youngest child of Tar-Meneldur (UT/173). Her name might be a compound of almë “blessing” and -iel “-daughter”.
Quenya
Almiel
daughter of blessedness
almiel
feminine name. ?Blessed Daughter
Elements
Word Gloss almë “good (or blessed) thing, blessing, piece of good fortune, good (or blessed) thing, blessing, piece of good fortune, *luck” -iel “-daughter; feminine suffix”
Almiel fem. name, perhaps *"daughter of blessedness": almië + -iel with contraction / haplology.