Livianus
Could not find Livianorum in Logeion dictionaries.
Livianorum Proper-name adjective: neuter genitive plural, Proper-name adjective: masculine genitive plural of Livianus
Līvĭānus, a, um, v. Livius, B.
Līviānus, a, um, s. Līviusa. E.
Līvĭānus, a, um, v. Livius et Livia.