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There is also a page called "Known Only by Their Nickname", which is basically the same as this page, so one should probably be deleted.
Only Known by Their Nickname is a characterization trope where someone In-Universe only has people call him by his nickname.
No Name Given, on the other hand, is a narrative trope where his name is never revealed to the audience.
For example, take the page quote from Only Known by Their Nickname into consideration. The Dude is Only Known by Their Nickname, but since he says his real name, it's certainly not No Name Given. On the flipside, let's take, say, Calvin's parents. They're No Name Given, even though they're not Only Known by Their Nickname since In-Universe, people assuredly call them by their names. However, that just isn't shown to the audience.
They're related (and assuredly overlap), but not the same trope. We've also got The Nameless, which is where a character literally doesn't have a name.
The reference to James Bond is partially incorrect. While M's name is never given in the movies, in the book 'The Man With The Golden Gun' Bond starts the book brainwashed trying to kill M. He calls in and tries to make contact, and uses M's real name: Admiral Sir Miles Messervy.
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