Elendil masc. name"Star-friend", "Lover or student of stars", applied to those devoted to astronomical lore. However, when the Edain used this name they intended it to mean "Elf-friend", confusing elen "star" and elda "elf" (WJ:410). (This idea that the name was misapplied seems to be late; Tolken earlier interpreted the name as an ancient compound Eled + ndil so that the meaning really was "Elf-friend"; see Letters:386. See also NIL/NDIL in the Etymologies, where Elendil is equated with "Ælfwine", Elf-friend.) Allative Elendilenna "to Elendil" (PM:401); Elendil Vorondo genitive of Elendil Voronda "Elendil the Steadfast" _(CO) Pl. Elendili the Númenórean Elf-friends (Silm)_; the variant Elendilli in SD:403 would seem to presuppose a stem-form Elendill- not attested elsewhere. Tar-Elendil a Númenorean king, UT:210.
Quenya
elendil
masculine name. Elf-friend, Star-lover
Elendil
star-friend
elendilmir
proper name. Star of Elendil
elendil’s oath
Elendil’s Oath
Elendil’s oath made upon arriving in Middle-earth, repeated by Aragorn when he assumed kingship of Gondor (LotR/967).
Eldandil
elf-friend
Eldandil (pl. Eldandili in WJ:412) noun "Elf-friend" (by the Edain confused with Elendil, properly "Star-friend") (WJ:410)
eldandil
masculine name. Elf-friend
quendil
masculine name. Elf-friend
Quendendil
elf-friend
Quendendil (also contracted Quendil; pl. Quendili in WJ:410) masc. name "Elf-friend" (WJ:410)
sin quentë quendingoldo elendilenna
*thus Pengoloð said to Elendil
ar elendil vorondo voronwë
and of the faith of Elendil the Faithful
Second phrase @@@
maquente elendil
*asked Elendil
Elendil
Devoted to the Stars
Elendil's name actually means "Devoted to the Stars" in Quenya.
For the Dúnedain it was intended to signify "Elf-friend" (Adûnaic Nimruzîr), since they tended to confuse the Quenya element EL for both "Elf" and "star".
tar-elendil
Tar-Elendil
Elendil means "Friend of the Elves" in Quenya (from elen "star, Elf" and -ndil "friend, lover, devoted to"). Like all the rulers of Númenor who took their royal names in Quenya, Elendil added the prefix tar- ("high") to his name when he received the Scepter. Tar-Elendil's Adûnaic name was "Ar-Nimruzîr" although it is not mentioned by Tolkien.
-dil
-wine
-dil, -ndil, ending that Tolkien likened to Old English "-wine", sc. "-friend" as part of names, e.g. Elendil, Eärendil (NIL/NDIL); see the entry -ndil. Also long -dildo (VT46:4), and possibly -(n)dilmë as the corresponding feminine form (see Vardilmë).
Elessar
elf-stone
Elessar masc. name "Elf-stone" (Elen + sar, actually "Star-stone", cf. Elendil concerning elen "star" being used to mean "Elf") (LotR3:V ch. 8). Genitive Elesarno _(VT49:28, read _Elessarno?) indicates that the stem is -sarn-. As a common noun, elessar or "elf-stone" may signify "beryl" (in the chapter Flight to the Ford in the LotR, Aragorn finds "a single pale-green jewel" and declares: "It is a beryl, an elf-stone"). Elessar as a name may also be seen as a pun or variant of Elesser "Elf-friend".
sin
thus
sin (1) a word either meaning "thus" (adverb) or "this" (as an independent word in the sentence, not modifying another word like sina does). Attested in the sentence sin quentë Quendingoldo Elendilenna, either *"this Pengolodh said to Elendil" or "thus spoke Pengolodh to Elendil" (PM:401). Patrick Wynne argues that sin is an adverb "thus" derived from the stem si- "this (by me)" (VT49:18)
voronda
steadfast in allegiance, in keeping oath or promise, faithful
voronda adj. "steadfast in allegiance, in keeping oath or promise, faithful", used as a title of Elendil Voronda "Elendil the Faithful"; genitive Vorondo in CO. Only glossed "faithful" in LT1:250.
-nil
-wine
-nil, final element in compounds, similar in meaning to Old English "-wine", sc. "-friend" as an element in names (NIL/NDIL). Also long -nildo (VT46:4). Variant of -ndil. In Eärnil, contraction of Earendil.
sië
thus
sië adv. "thus" (VT43:24, VT49:18)
sië
adverb. thus
vórima
steadfast in allegiance, in keeping oath or promise, faithful
vórima (more or less identical to vorima above?) adj. "steadfast in allegiance, in keeping oath or promise, faithful"; genitive vórimo in a variant of CO; see UT:317. In VT45:7, vórima is glossed "continuous, enduring, repeated".
Tar-Elendil was the fourth ruler of Númenor (UTI/219). Many centuries later a second, more famous, Elendil became the leader of the Men of the West against Sauron at the end of the Second Age and was considered the first king of Gondor and Arnor (LotR/1037). This name is attributed two different meanings: “Elf-friend” and “Star-lover” (WJ/410). The first interpretation was common among Men, and was derived from the ancient associations between Elda “Elf” and †él “star”. Properly speaking, though, his name was a compound of elen “star” and the suffix -(n)dil “lover”, so “Star-lover” is a better interpretation in proper Quenya. The proper Quenya for “Elf-friend” would be Eldandil.
Conceptual Development: In the very first draft of the tale of the Fall of Númenor, this character was named N. Agaldor > N. Amroth (LR/12, 31). When this character first appeared in the “Lost Road”, his name was ᴹQ. Herendil “Fortune’s Friend” and his father was called ᴹQ. Elendil (LR/57). In “The Notion Club Papers”, the character was given the Adûnaic name Ad. Nimruzân >> Nimruzîr “Elf-friend” (SD/389-90), and his contemporaneous Quenya name also shifted to ᴹQ. Elendil (SD/356). His father became ᴹQ. Amardil, later Q. Amandil.
The earlier character Ælfwine might be consider a precursor to Elendil, at least in the meaning of his name: “Elf-friend”. Therefore, the Early Qenya name ᴱQ. Eldairon of Ælfwine could be considered a precursor to the name Elendil (LT2/313).