Stated to be an alteration of sell , remodelled after ion "son" (OS *jondo). It was "a change assisted by the loss of s in compounds and patronymics", hence the ending -iel in several feminine words
Noldorin
uinen
feminine name. Uinen
nen
noun. water
nen
noun. water (used of a lake, pool or lesser river)
nen
noun. waterland
amon
noun. hill, steep-sided mount
amon
noun. hill
dath
noun. hole, pit, steep fall, abyss
gas
noun. hole, gap
iell
noun. daughter
iell
noun. girl, maid
iell
noun. daughter
lhorn
noun. quiet water
lhorn
noun. anchorage, harbour
mindon
noun. isolated hill, especially a hill with a watch tower
mindon
noun. tower
sell
noun. daughter
sell
noun. girl, maid (child)
ters
noun. (fine pierced) hole
tess
noun. (fine pierced) hole
torech
noun. hole, excavation, lair
tund
noun. hill, mound
tunn
noun. hill, mound
Noldorin name of ᴹQ. Uinen from The Etymologies from the 1930s (Ety/NEN, UY) derived from the same primitive form ✱✶Uinendă, as indicated by ON. Uinenda and the Quenya stem-form Uindend-.
Conceptual Development: In the Gnomish Lexicon from the 1910s, her Gnomish name was G. Uinen (GL/74), while her usual Qenya name from this period was ᴱQ. Ónen (LT1/61).