A rose-filled valley in Gondor (LotR/866) translated “Lovely Flowery Vale” (RC/582) or “Sweet Flower-valley” (VT42/18), a combination of †im “valley” and loth “flower” (VT42/18) with otherwise unattested melui “lovely”.
Conceptual Development: In Lord of the Rings drafts from the 1940s, this name was already N. Imloth Melui.
im (“between, within”) + loth (“a head of small flowers”), mel (“dear”) + ui (adjective suffix) #M sometimes resists lenition when otherwise may cause confusion.