Cepheius
Could not find Cepheia in Logeion dictionaries.
Cepheia Proper-name adjective: neuter nominative plural, Proper-name adjective: neuter vocative plural, Proper-name adjective: feminine nominative singular, Proper-name adjective: feminine ablative singular, Proper-name adjective: feminine vocative singular, Proper-name adjective: neuter accusative plural of Cepheius
Cephēïus, a, um, v. Cepheus, II. A.
Cēphēĭus, v. Cephēus.