Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Ē̆sāĭās, ae, m. [Heb.], the Jewish prophet Isaian, Lact. 4, 11, 10; Prud. στεφ. 5, 524.
Hence, Ēsāĭānus, a, um, adj., of Isaiah, Sulp. Sev. Ep. 2, 10.
Īsaias (Esaias), ae, m., the prophet Isaiah, Paul. Nol. Carm. 23, 195; Prud. στεφ. 5, 524.
Form Esaias, Alcim. Carm. 6, 44.