Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Alceus (dissyl.), ĕi and ĕos, m., = Ἀλκεύς, father of Amphitryo and grandfather of Hercules, who was named Alcides from him, Serv. ad Verg. A. 6, 392.