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; 用來稱呼由于法律等原因不能公布真實姓名的男性[美國英語]

In fact he's not John Doe anymore, we have an ID. 事實上他不再是某男了，我們有一張身份證件。