Lewis & Short

2. Commŏdus, i, m., a Roman cognomen; so L. Aelius Aurelius Commodus, Roman emperor, Lampr. Commod. 1 sq.; Eutr. 8, 15 al.
Hence,

    1. 1. Commŏdĭā-nus, a, um, adj., of or pertaining to Commodus: horti, Lampr. Commod. 8: thermae, Spart. Nigid. 6 al.
    2. 2. Commŏ-dĭus, a, um, adj., the same: Nonae, Lampr. Commod. 12; cf. id. ib. 11.
    3. 3. Commŏ-dus, a, um, adj., the same: mensis, i. e. August, which Commodus wished to name after himself, Lampr. Commod. 11.