Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Callĭpho, ōnis (abl. -ōne, Plaut. Ps. 1, 4, 18), m., a character in the Pseudolus of Plautus, Plaut. Ps. 1, 5, 43 et saep.
Callĭphōn (-pho in all pass. of Cic. acc. to Madv. ad Cic. Fin. 2, 6, 19), ontis (dat. -ōni, Cic. Fin. 5, 8, 21; acc. -ōnem, id. Off. 3, 33, 119), m., = Καλλιφῶν, ῶντος, a Greek philosopher who considered virtue, joined with pleasure, as the highest good, Cic. Tusc. 5, 30, 85; id. Ac. 2, 42, 131; id. Fin. 2, 6, 19; 2, 11, 34; 4, 18, 50; 5, 8, 21; 5, 25, 73; Lact. 3, 7, 7; id. Epit. 33, 7.