Marcellianus
Could not find Marcelliani in Logeion dictionaries.
Marcelliani Proper-name adjective: masculine vocative plural, Proper-name adjective: neuter genitive singular, Proper-name adjective: masculine nominative plural, Proper-name adjective: masculine genitive singular of Marcellianus
Mārcellĭānus, (16) a, um, de Marcellus : Suet. Vesp. 19 ; Aug. 29.