Isiacus
Could not find Isiacos in Logeion dictionaries.
Isiacos Proper-name noun: masculine accusative plural, Proper-name adjective: masculine accusative plural of Isiacus
Īsĭăcus, a, um, v. Isis, II.
Īsiacus, a, um, s. Īsis.
Īsĭăcus, (15) a, um, dʼIsis : Ov. P. 1, 1, 52 || subst. m. , prêtre dʼIsis : Plin. 27, 53 ; Suet. Dom. 1.