Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Vespasĭus, i, m.; Vespasĭa, ae, f., the name of a Roman gens; e. g. Vespasia Polla, the mother of Vespasian, Suet. Vesp. 1: Vespasius Pollio, the father of Vespasia Polla, id. ib. 1.