Primitive elvish
hek
root. aside, apart, separate
hek-wā
preposition and adverb. leaving aside, not counting, excluding, except
heke
adverb. apart, not including
hekelā
noun. a waif or outcast
hekla
proper name. any thing (or person) put aside from or left out from its normal company
heklō
noun. a waif or outcast
hektā
verb. set aside, cast out, forsake
hekla-mbar
place name. Eglamar
hekla-rista
place name. Eglarest
heklanā
adjective. forsaken
satya-
verb. set aside
This root appeared in the Quendi and Eldar essay from 1959-60 glossed “aside, apart, separate” (WJ/361) with derivatives having mostly to do with exclusion, abandonment and outcasts, such as: Q. hequa/T. heco “excluding, except”; Q. heca/S. ego “be gone!”; Q. hehta-/T. hecta- “abandon”; Q. hecil/S. eglan “outcast, (one) forsaken” (WJ/364-5). The last of these is especially notable, in that it is the basis for S. †Eglan “Forsaken (Elf)”, one of the names the Sindar used for themselves, especially among the people of Círdan.
Although there are no obvious precursors to √HEK itself in the sense “apart, separate”, Egla was long among the words Tolkien used for the Elves, along with related names like Eglamar, originally “Elfhome” and later “Home of the Eglain”. It appeared as G. Egla “being from outside” in the Gnomish Lexicon of the 1910s, based on G. eg “far away” < ᴱ√EIKA (GL/32). In the 1930s this became Ilk. Egla “Star-folk, Elf” < ᴹ√ed(e)la with the Ilkorin sound change whereby [[ilk|[dl] became [gl]]] (Ety/ELED). Thus it seems √HEK was Tolkien’s latest attempt to preserve Elga(n) as a word for Elves, though with a different meaning than its earlier incarnations.