A noun in The Etymologies of the 1930s glossed “shining jewel” derived from the root ᴹ√MBIRIL = ᴹ√MIR + ᴹ√RIL (Ety/MBIRIL).
Qenya
mir
preposition/adverb. to the inside, into
mirimor
collective name. Mirimor
miril
noun. shining jewel
mirilya-
verb. to glitter
mirima
adjective. free
míre
noun. jewel, precious thing, treasure
makso
noun. sticky substance, mire
silmaril
proper name. Silmaril
alasse
noun. joy, merriment
noldomír(e)
proper name. Silmaril
(a)ranya
adjective. free
ho
preposition. from
hyelle
noun. glass
ilumíre
proper name. Silmaril
kanta
cardinal. four
min
cardinal. one
mine
cardinal. one
ranya
adjective. free
tanna
adverb. thither
Another name for the Teleri appearing in The Etymologies from the 1930s (Ety/MIS). It seems to mirima “free” pluralized as a collective name.