Matianus
Could not find Matianum in Logeion dictionaries.
Matianum Proper-name adjective: neuter vocative singular, Proper-name adjective: masculine genitive plural, Proper-name adjective: masculine accusative singular, Proper-name adjective: neuter genitive plural, Proper-name adjective: neuter nominative singular, Proper-name adjective: neuter accusative singular of Matianus
Mātiānus, a, um, s. Mātius.
Mătĭānus, (16) a, um, de Matius : Suet. Dom. 21.