User blog comment:B214/High School DxD DX.4 discussion/@comment-30924344-20180125103734/@comment-30924344-20180126020741

@B214 Alright so just confirmed with Code Zero. Cao Cao is not his first nor last name. He learns about Cao Cao's name and that he carries his blood when he first activated True Longinus. So 'Cao Cao' isn't his birth name but that's the name he goes by now.