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.