The northern kingdom of the Dúnedain (LotR/242), variously translated as “Royal Land” (Let/428), “Noble Land” (PE17/28) or “King(ly) Land” (PE17/28, PE17/118). In ordinary Sindarin, this name would have been ✱✱Ardor, a combination of the prefix ar(a)- “noble, royal” and the noun dôr “land” (Let/428, PE17/118). It was, however, blended with or adapted from its Quenya name Aran(d)órë (Let/428, PE17/28).
Sindarin
arn
adjective. royal
argonath
place name. Pillars of the Kings, (lit.) Royal Stones
arnor
place name. Royal Land
pelargir
place name. Garth of Royal Ships
A Gondorian city at the mouth of the Anduin (LotR/789), translated “Garth of Royal Ships” (RC/535), a combination of pêl “fenced field”, the prefix ar(a)- “royal” and the lenited form of the plural cîr of cair “ship” (RC/625).
Conceptual Development: In Lord of the Rings drafts from the 1940s, this name first appeared as N. Pelargir (WR/268).
Arador
noun. royal lord
ara (prefix “high, noble, royal”) + taur (“king, lord”)
Aravir
noun. royal jewel
ara (prefix “high, noble, royal”) + mîr (“jewel, treasure”)
Argeleb
noun. royal silver
ar (prefix “high, noble, royal”) + #celeb (“silver”)
Argonath
noun. royal stones
arn (prefix “royal”) + gond (“great stone, rock”) + ath (collective plural suffix). Triconsonantal cluster rgn produces rg; in this case original nd doesn’t produce nn before the collective plural suffix ath. #It might be a dialectal form or a mistake on the part of Gondorians who didn't always use Elvish languages correctly (VT42 “Rivers and Beacon-hills”).
Argonui
noun. royal valour
ar (prefix “high, noble, royal”) + caun (“valor”) + ui (adjectival suffix)
Arvegil
noun. royal sword
ar (prefix “high, noble, royal”) + megil (“sword”)
Lonnath Ernin
noun. royal havens
lond (“haven”) + ath (collective plural suffix), ernin (pl. of arnen “royal”) For possible interpretations see [His.] entry arnen.
Pelargir
noun. harbour of royal ships
pel (from stem pel- “go round, revolve”) + ar(a) (“royal, noble”) + cîr (pl. of cair “ship”)
arnen
adjective. (?) royal
Originally, Lonnath-Ernin might have been intended to mean 'royal havens', assuming the second element to be a regular adjective. However, the second element in Emyn Arnen 'hills of Arnen' is singular, and Tolkien later decided that it should mean 'Hill beside the water', see VT/42:17 and HL/119-124. Nevertheless, this meaning cannot apply to Lonnath-Ernin (havens are near water by definition), so unless we entirely reject this earlier form, we may assume that an adjective 'royal' is still possible.
arwen
noun. royal, noble maiden
ar (prefix “high, noble, royal”) + gwend (“maiden, woman”)
ar(a)-
prefix. noble, royal, high
araglas
masculine name. *Royal-joy
The 6th chieftain of the Dúnedain (LotR/1038). The initial element of his name is the prefix ar(a)- “noble” and its final element might be [N.] glass “joy” (as suggested by David Salo, GS/341).
Conceptual Development: In the draft of Appendix A of the Lord of the Rings, his name was first given as Arallas, revised to Araglas (PM/211).
Ara-
prefix. high, noble, royal
Araglas
noun. royal joy
aran (“king”) + glass (“joy”)
Aragost
noun. royal dread
aran (“king”) + gost (“dread”)
Aranrúth
noun. royal anger
aran (“king”) + rûth (“anger”) The archaic origin of the name can probably explain why assimilation nr > dhr doesn't take place.
Araphor
noun. royal fist
aran (“king”) + paur (“fist”)
Arathorn
noun. royal eagle
aran (“king”) + thorn (“eagle”)
ar-
prefix. high, noble, royal
ar
royal
(adj. prefix) ar- (noble, high). In the form ar(a)- this is an element in the names of the kings of Arnor and Arthedain.
ar
royal
(noble, high). In the form ar(a)- this is an element in the names of the kings of Arnor and Arthedain.
arn
royal
arn (noble), pl. ern
arn
royal
(noble), pl. ern
ruindol
noun. flame tree, peacock flower, royal poinciana, phoenix flower, flame of the forest, Delonix regia, (lit.) blazing-head
Two statues of Gondorian kings just north of Nen Hithoel, translated “Pillars of the Kings” (LotR/392), more literally “(Pair of) Royal Stones” (RC/347, RGEO/67, Let/427). It is combination of the prefix ar(a)- “noble”, the noun gond “stone”, and the class-plural suffix -ath (RC/347).
It is not clear why this noun uses the class-plural. However, in one place Tolkien describes a dual variant argonad using the archaic dual suffix †-ad (Let/427). Perhaps this was the original form of the name, altered to Argonath after the Sindarin dual form was forgotten.
Conceptual Development: In Lord of the Rings drafts from the 1940s, this name first appeared as N. Sern Aran(ath) “King Stones” along with an alternate name N. Sern Ubed “[Stones of] Denial” (WR/98, 132). Later in these drafts it was revised to N. Argonath (TI/366).