Earlier name for the river S. Erui from Lord of the Rings drafts from the 1940s, apparently a Noldorin word meaning ereg “first” (TI/312, WR/436).
Noldorin
seth
adjective. first, forth
sethnoss
proper name. Firstborn, Elves
afarch
adjective. very dry, arid
edhen
adjective. first
ereg
place name. First
ereg
adjective. first
parch
adjective. dry
parch
adjective. dry
A rejected term for the Elves as Firstborn of Iluvator (EtyAC/SET), a combination of (rejected) seth “first” and noss “clan”. The Sindarin form of this term did not appear in Tolkien’s later writing, though the inverse term S. Abonnen “After-born” for Men did appear.