Quenya 

atar

father

atar noun "father" (SA; WJ:402, UT:193, LT1:255, VT43:37, VT44:12). According to the Etymologies (ATA) the pl. is atari, but contrast #atári in Atanatári "Fathers of Men" (q.v.); possibly the word behaves differently when compounded. Atarinya "my father" (LR:70), atar(inya) the form a child would use addressing his or her father, also reduced to atya (VT47:26). Diminutive masc. name Atarincë ("k") "Little father", amilessë (never used in narrative) of Curufinwë = Curufin (PM:353). Átaremma, Ataremma "our Father" as the first word of the Quenya translation of the Lord's Prayer, written before Tolkien changed -mm- as the marker of 1st person pl. exclusive to -lm-; notice -e- as a connecting vowel before the ending -mma "our". In some versions of the Lord's Prayer, including the final version, the initial a of atar "father" is lengthened, producing #átar. This may be a contraction of *a atar "o Father", or the vowel may be lengthened to give special emphasis to #Átar "Father" as a religious title (VT43:13). However, in VT44:12 Atar is also a vocative form referring to God, and yet the initial vowel remains short.