Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. Măro, ōnis, m. [from root smar-, to be thoughtful; cf. memor], the family name of the poet P. Vergilius, Lact. 1, 15, 12: ingenium sacri miraris abesse Maronis: Sint Maecenates, non deerunt, Flacce, Marones, Mart. 8, 56, 5: summus, id. 12, 4, 1: altisonus, Juv. 11, 180.
Transf., a statue of Virgil, Juv. 7, 227.
Hence,
2. Măro, ōnis, m., a mountain in Sicily, near the river Himera, Plin. 3, 8, 14, § 88 (dub.; Jan., ad Maroneum et Gemellos colles).
3. Măro, ōnis, m., = Μἀρων,