Tar-Minyatur was the title assumed by Elros as the first ruler of Númenor (LotR/1035, UT/218), translated “First-ruler” (PM/384). This name is a compound of minya “first” and -tur “ruler” (SA/minya, tur).
Quenya
Minyatur
first-ruler
minyatur
masculine name. First-ruler
Elements
Word Gloss minya “first; eminent, prominent” -tur “master, lord, ruler, master, lord, ruler, [ᴹQ.] victor”
minya
first
minya adj. "first" (MINI) (cf. Minyatur, Minyon); "eminent, prominent" (VT42:24, 25). Minyar "Firsts", the original name of the Vanyar (or rather the direct Quenya descendant of the original Primitive Quendian name) (WJ:380)
inga
first
inga (2) adj. "first" (ING)
enna
first
[enna adj. "first" (VT45:12)]
esta
first
esta (2) adj. "first" (ESE/ESET); this entry was marked with a query. The word Yestarë (q.v.) "Beginning-day" in LotR suggests that Tolkien decided to change the stem in question to _YESE/YESET_. We could then read *yesta for esta (but later this became a noun "beginning" rather than an adj. "first", PE17:120) and also prefix a y to the other words derived from ESE/ESET (essë* > yessë, essëa > yessëa). Estanossë noun "the firstborn", read likewise Yestanossë** (*Yestanessi?) but in a later text, Tolkien used Minnónar (q.v.) for "the Firstborn" as a name of the Elves, and this form may be preferred. _(In the Etymologies as printed in LR, the word _Estanossë is cited as "Estanesse", but according to VT45:12, the second-to-last vowel is actually o in Tolkien's manuscript.)
setta
first
[setta, setya adj. "first" (possibly also "primary", but Tolkien's gloss was not certainly legible) (VT46:13)]
Minyatur noun "First-ruler"; Tar-Minyatur "High First-ruler", title of Elros as the first King of Númenor (SA:minas, PM:348, SA:tur)