A name for region of Beleriand where the people of Círdan dwelled (WJ/379). This name is effectively a combination of the prefixal form Egla- of Eglan “Forsaken (Elf)” and dôr “land”, derived from ancient ✶etlā-ndŏrē (VT42/4).
Conceptual Development: In The Etymologies from the 1930s, the Ilkorin name Eglador appeared as a name for Doriath translated “Land of the Elves” (Ety/AR², ELED, GAT(H)). This earlier name was derived from the Ilkorin word for “Elf”: Ilk. Egla. After Tolkien abandoned the Ilkorin language, the name reappeared in his Quendi and Eldar essay from 1959-60, with the revised meaning given above (WJ/379).
@@@ revised etymology
eglan (“elf, Falathrim”) + (n-)dor (“land, dwelling place”)