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” -iel “-daughter; feminine suffix”
Almiel fem. name, perhaps *"daughter of blessedness": almië + -iel with contraction / haplology.