-on gen.pl. ending (3O), in aldaron, aranion, elenion, Eldaron, #esseron, Ingweron, Istarion, Númevalion, Quendion, Silmarillion, Sindaron, tasarion (see Nan-Tasarion), Valion, wenderon, yénion. Normally the ending -on is added to the nominative plural, whether it ends in -i or -r, but some nouns in -ë that would have nominative plurals in -i seem to prefer the ending -ron in the genitive (hence #esseron as the gen. pl. of essë "name", though the nominative pl. is attested as essi and we might have expected the gen. pl. *ession; similarly wenderon, Ingweron).
Quenya
aran
king
aran
noun. king
-on
name
asëa
beneficial, helpful, kindly
asëa (þ) 1) adj. "beneficial, helpful, kindly" _(so according to a late note where the word is derived from *ATHAYA)_; hence also: 2) asëa (þ) noun,name of the healing plant called in Sindarin athelas(PE17:148), in English (representing Westron) called "kingsfoil", cf. longer Quenya name asëa aranion (þ) "asëa of kings" (LotR3:V ch. 8). Cf. aran.
-tar
king
-tar or tar-, element meaning "king" or "queen" in compounds and names (TĀ/TA3), e.g. Valatar; compare the independent nouns tár, tári. Prefix Tar- especially in the names of the Kings and Queens of Númenor (e.g. Tar-Amandil); see their individual names (like Amandil in this case), cf. also Tar-Mairon "King Excellent", title used by Sauron (PE17:183). Also in Tareldar "High-elves"; see also Tarmenel.
essë
name
essë (1) noun "name", also later name of Tengwa #31, originally (MET) called árë (ázë). (Appendix E). With a pronominal ending esselya "thy name" (VT43:14). Pl. #essi in PM:339 and MR:470, gen.pl. #esseron "of names" in the compound Nómesseron (q.v.); we would rather have expected *ession, given the nom.pl. essi; perhaps #esser is a valid alternative plural form. Essecarmë noun "name-making" (MR:214, 470), Eldarin ceremony where the father announces the name of his child. Essecenta *("k") noun "Name-essay" (see centa) (MR:415); Essecilmë noun "name-choosing", an Eldarin ceremony where a child named him- or herself according to personal lámatyávë (q.v.) (MR:214, 471). The meaning Tolkien originally assigned to the word essë** in the Etymologies was "place" rather than "name" (VT45:12).
haran
king, chieftain
haran (#harn-, as in pl. harni) noun "king, chieftain" (3AR, TĀ/TA3, VT45:17; for "king", the word aran is to be preferred in LotR-style Quenya). In a deleted entry in the Etymologies, haran was glossed "chief" (VT45:17)
sanda
name
[sanda, sandë] (þ) (2) noun "name" (VT46:16)
sanya
name
[sanya] (þ) (2) noun ?"name" (reading of gloss uncertain, VT46:16)
taran
king
taran (1) noun "king", possibly ephemeral variant of aran, q.v. (PE17:186)
tár
king
tár noun "king" (only used of the legitimate kings of whole tribes); the pl. tári "kings" must not be confused with the sg. tári "queen" (TĀ/TA3). Prefix tar-, compare -tar above. The normal Quenya word for "king" is aran, but compare Tarumbar.
túr
king
túr, tur noun "king" (PE16:138, LT1:260); rather aran in LotR-style Quenya, but cf. the verb tur-. Also compare the final element -tur, -ntur "lord" in names like Axantur, Falastur, Fëanturi, Vëantur (q.v.)
vardar
king
vardar noun "king" (LT1:273; rather aran in LotR-style Quenya)
esse
noun. name
essë
noun. name
esta-
verb. name
eldatár
`Vm#1~C6 noun. elf-king, elfking, elven-king
aran noun "king"; pl. arani (WJ:369, VT45:16, PE17:186); gen.pl. aranion "of kings" in asëa aranion, q.v.; aranya "my king" (aran + nya) (UT:193). Aran Meletyalda "king your mighty" = "your majesty" (WJ:369); aran Ondórëo, "a king of Gondor" (VT49:27). Also in arandil "king's friend, royalist", arandur "king's servant, minister" (Letters:386); Arantar masc. name, "King-Lord" (Appendix A); Arandor "Kingsland" region in Númenor (UT:165); the long form Arandórë appears as a name of Arnor in PE17:28 (elsewhere Arnanórë, q.v.) Othercompounds ingaran, Noldóran, Núaran, q.v.