Eilenach

Eilenach was the second of the seven beacon-hills of Gondor, after Amon Dîn in the east, it lay in the Drúadan Forest. Following is an article from the Tolkien Linguistic Dictionary concerning its name:

Eilenach — said to be 'pre-Númenórean' or M; ?Fire Tooth; [perhaps the most researched Tolkien term by this author]; little is known of this beacon except that it is closely related etymologically to Halifirien, which was once called Eilenear; Halifirien ['holy mountain'] was a religious site of old, and further sanctified by the secret entombing of Isildur; the name could relate loosely to the Elvish 3EL- sky, Nol elle, eilian [Etym], and AK- narrow, confined [Etym] - narrow sky, as the hill rose steeply out of the midst of the Druadan Forest; relating eilen- to AS halig 'holy', it might point back to Old Norse heilag; it would seem, however, that the term relates more closely to modern 'heal(-ing)', of similar derivation as 'holy'; the AS was hælan, Old Saxon helian, German heilen [see Old Norse heill, heilan healing]; perhaps distantly related is the Greek ailin dirge; also possible is AS æling burning, perhaps here relating to funeral pyres; Gaelic eilean means an 'island' [above the forest cover?], Early Irish ailén [Gaelic ail = rock, stone]; -nach could relate to Middle Dutch nocke summit, Middle English nocke, from a root *hnukk- 'sharp projection, tip', or may be an adjectival or agental suffix in Gaelic: ?'The Rock (place)'; one of the beacon hills of Gondor, although the summit was said to be too small for a large fire