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).
Quenya
Elenarda
star-kingdom
Elenarda place-name "Star-kingdom", upper sky (3AR). Deleted material in the Etymologies defined elenarda as "star-realm", "upper air or sky" (VT45:16). Compare elen, (h)arda.