The Quenya name Maiar means "the Beautiful".
Quenya
Maia
the beautiful
maia
noun. (angelic) spirit, the Beautiful
maiya
noun. (angelic) spirit
maiar
Maiar
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).