An alternate name of Ilmen in Silmarillion notes from the 1930s (SM/241), also appearing in The Etymologies as compound of elen “star” and arda “realm” (Ety/ƷAR|GAR). At one point it was used as an early name for Calenardhon in Lord of the Rings drafts from the 1940s (WR/155).
Qenya
elen
noun. star
ellen
noun. star
elentāri vardan oiolossëan tintallen māli rāmar ortelūmenen
Elentāri Vardan Oiolossëan Tintallen māli rāmar ortelūmenen
elendilion
proper name. Descendant of Elendil
elenarda
place name. Star-kingdom
elen sile lúmesse omentiemman
a star shines on the hour of our meeting
elende
place name. Elfland
elendil
masculine name. Elf-friend
elendilli
collective name. Elf-friends
elentári
feminine name. Queen of Stars, (lit.) Star Queen
elena
noun. star
elenya
noun. Saturday, *Star-day
tári
noun. queen
tar-ellion
feminine name. Queen of the Stars
elesser
masculine name. Elf-friend
tinwerontar
feminine name. Queen of Stars
él
noun. star
atta
cardinal. two
elda
noun. Elf
eldanor
place name. Elfland
esse
noun. name
nelde
cardinal. three
qen
noun. Elf
qende
noun. Elf
tinwetári
feminine name. Queen of Stars
Apparently a name for the kings of Gondor as descendants of Elendil in Lord of the Rings drafts from the 1940s, appearing in its Anglicanized plural “Elendilions” (WR/76). It is a compound of the name Elendil and the patronymic suffix -ion.