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The saints' original names were the Latin Augustinus and Constantinus, not Augustin or Constantin. And Augustine and Constantine are not feminine names in Latin. In English the -us or -ius endings were sometimes removed from Latin names to anglicise them, e.g. Marcus to Mark, Dominicus to Dominic, Vespasianus to Vespasian, Antonius to Ant(h)ony. I don't know exactly why the -e got tacked on to Augustine and Constantine, but probably because as an English speaker they look more complete and correct than Augustin or Constantin. Names generally don't end with -in in English. The only one I can think of right now is Justin.