Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Phlĕgyas, ae (acc. -an, Val. Fl. 2, 193), m., = Φλεγύας, the son of Mars, king of the Lapithœ, and father of Ixion and Coronis, Verg. A. 6, 618 Serv.; Stat. Th. 1, 713.