Inachius
Could not find Inachiumque in Logeion dictionaries.
Inachiumque 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 Inachius
Īnachius, s. Īnachus.
Īnăchĭus, (12) a, um, dʼInachus, dʼIo : Virg. En. 7, 286 ; Ov. F. 3, 658 || dʼArgos, Argien : Virg. En. 11, 286 ; Ov. F. 5, 656.