The only cognomen found among the Caedicii of the Republic is "Noctua", an owl. Surnames derived from familiar objects and animals were quite common at Rome. "Noctia" seems to have been a personal cognomen, as it was not borne by later Caedicii. None of the other Caedicii mentioned in history bore any surname. Several numismatists, such as Grueber, nevertheless suggest that this cognomen was a reference to a supernatural warning that Marcus Caedicius witnessed before the Gallic Sack of Rome in 390 BC.