Reflect, that certain biographies of Julius / Iulius Caesar, suggest that he was also made head of religion in Rome! Therefor, if it really did happen, he was made the Pontif Maximus! This, of course, equals Pope! Pope = Father = Pater, etc. (As well as Rock!), thus Anti when it equals "against", and "patre" or "pater", when it equals "Pope", whould indicate a son (which all Catholic fathers call members of their flock, regardless of relationship.)
Thus Antony = Antipater = would indicate a "son" against the religious leader "Pope", etc. Of course there might also be a real relationship also?
© Charles N. Pope, US Library of Congress. All rights reserved.