The Quenya name Maiar means "the Beautiful".
Quenya
Maia
the beautiful
maia
noun. (angelic) spirit, the Beautiful
maiya
noun. (angelic) spirit
valar ar maiar fantaner nassentar fanainen ve quenderinwe coar ar larmar
Valar and Maiar cloaked their true-being in veils, like to Elvish bodies and raiment
nasser ar cenime cantar valaron ar maiaron
The Natures and Visible Shapes of the Valar and Maiar
maiar
Maiar
Ainu
holy one, angelic spirit
Ainu noun "holy one, angelic spirit"; fem. Aini (AYAN, LT1:248); "one of the 'order' of the Valar and Maiar, made before Eä"; pl. Ainur is attested. Adopted and adapted from Valarin ayanūz(WJ:399). In the early "Qenya Lexicon", ainu was glossed "a pagan god", and aini was similarly "a pagan goddess", but as Christopher Tolkien notes, "Of course no one within the context of the mythology can call the Ainur 'pagan' " (LT1:248). Ainulindalë noun "Music of the Ainur" (SA:lin #2), the First History (WJ:406), the Song of Creation (AYAN)
Vanimo
the beautiful
Vanimo (pl. Vanimor given), noun "the beautiful", children of the Valar (BAN), or "fair folk" = (men and) elves (UGU/UMU, VT45:17). Negated úvanimor = "monsters".
Maia pl. Maiar noun "the Beautiful" (MR:49), the lesser (= non-Vala) Ainur that entered Eä. Variant Máya in VT42:13/VT47:18, pl. Máyar in PM:363, 364 and VT47:18 (possibly, Máya is to be understood as the older form of Maia). With negative prefix ú- also Úmaiar, Maiar who became evil and followed Melkor, such as Balrogs (MR:79, "Umaiar", MR:165).