Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Issa, ae, f., = Ἴσσα,
Issē, ēs, f., the daughter of the Lesbian king Macareus, who is said to have been seduced by Apollo under the form of a shepherd, Ov. M. 6, 124.
‡ 1. issus, a, um, adj., a childish form of ipse, used with little children as a term of endearment: ISSA HAVE, Inscr. ap. Fabr. p. 45, n. 255.
Issa, the name of a pet slut, Mart. 1, 109.
Also dim.: ‡ issŭlus, a, um, Inscr. ap. Fabr. n. 254.