John Doe

1. N-COUNT John Doe is used to refer to a man whose real name is not known or cannot be revealed, for example, for legal reasons. 某男; 用来称呼由于法律等原因不能公布真实姓名的男性[美国英语]

In fact he's not John Doe anymore, we have an ID. 事实上他不再是某男了，我们有一张身份证件。