"eagle's nest," 1580s (attested in Anglo-L. from early 13c.), from O.Fr. aire, from L.L. area "nest of a bird of prey," perhaps from L. area "level ground, garden bed," though some doubt this. Another theory connects it to atrium. Formerly misspelled eyrie (1660s) on the
mistaken assumption that it derived from M.E. ey "egg."