Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. nĕpōtilla, ae, f. dim. [1. nepos], a little granddaughter, Inscr. Fabr. p. 31, n. 148.
2. Nĕpōtilla, ae, f., a Roman surname: IVLIA NEPOTILLA, Inscr. Grut. 916, 1.