LSJ
ή, όν, = Ἑσπέριος, X. Lac. 12.6, AP 5.201 (Asclep. or Posidipp.), Ptol. Alm. 8.4, D.C. 69.18 ; θυσία LXX 4 Ki. 16.15, al. ; Ἑσπέρινος, ὁ (sc. μήν), name of month in Doris, GDI 2172 (Erineos).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)