Fëanáro masc. name "Spirit of Fire", in Sindarized form Fëanor(SA:nár, PHAY, MR:206). The word apparently includes the masculine ending -o. Compare fëa, nár.
Quenya
fëanáro
masculine name. Spirit of Fire
Fëanáro
spirit of fire
Sindarin
Feanor
Feanáro
prop. n. -. Q. Feanáro.
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
Qenya
feanáro
masculine name. Radiant Sun
The mother-name of Fëanor by which he was usually known, and from which his Sindarin name was derived (MR/217, PM/343). His name contains the elements fëa “spirit” and nár “fire”, but the name is actually an old compound, developed from ancient ✶Phayanāro (PE17/39, Ety/PHAY).
Conceptual Development: Curiously, in the Gnomish Lexicon from the 1910s, ᴱQ. Feanor was marked as Qenya (GL/35), corresponding to G. Fionor “Goblet Smith”, but it seems unlikely that this was a lasting idea. In the earliest Lost Tales, Feanor was probably so named in his own language, Gnomish (LT1/128). His later Quenya name ᴹQ. Feanáro first appeared in The Etymologies, where it is translated as “Radiant Sun” (Ety/PHAY). The interpretation as “Spirit of Fire” appears in texts from the 1950s and 1960s, as noted above (MR/217, PM/343).