Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Ismaël, ēlis, or indecl., m., Abraham’s son by Hagar, Ishmael, Vulg. Gen. 16, 15 sqq.; gen. Ismaël, id. ib. 25, 12: -ēlis, id. ib. 25, 16.
Hence, Ismăēlītes, ae, m., a descendant of Ishmael, Vulg. 1 Par. 2, 17; id. Gen. 37, 27.