Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Mōses or Mo[dibreve]ȳses, is or i, m. (in Vulg. nom. semper Mo[dibreve]ȳses; gen. Mo[dibreve]ȳsi, Lev. 8, 36; 16, 34; Num. 3, 1; 33, 1, etc.: Mosi, Sedul. 5, 274), = Μωσῆς, Μωυσῆς, Moses: Moses, Juv. 14, 102: Moyses, Tac. H. 5, 4: Moysen unum exsulum monuisse, ut, etc., id. ib. 5, 3: a Mose, Plin. 30, 1, 2, § 11: successor fuit Mosi, Lact. 4, 14: clarum videre Mŏysen, Sedul. 3, 285; Prud. Ham. 340.
Hence,
Moyses, v. Moses.