Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Caepasĭus, ii, m., a Roman proper name: esp., C. and L. Caepasius, two orators, Cic. Brut. 69. 242; id. Clu. 20, 57; Jul. Vict. Art. Rhet. 17.