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That's often how nicknames work, though. Look at In-Series Nickname, and there are many examples of nicknames with no resemblance to the real name.
If it's an amusingly short nickname for a very long or difficult to pronounce name, do look at Some Call Me "Tim".
Edited by KDYeah, it's very common—both in real life and in fiction—to give someone a nickname that's a description of them in some way, rather than derived from their name. In Rita Hayworth and Shawshank Redemption there's a red-haired Irish character only ever known as "Red". In To Have and Have Not Harry and Marie call each other "Slim" (cuz she's skinny) and "Steve" (short for "stevedore"). In my last job, some coworkers called me "Tunes" because I was always listening to music in my cubical as I worked.
If the nickname isn't derived from the character's name, and it's an inaccurate description of the character, then you've got an Ironic Nickname.
Edited by MetaFourHm, alright then. Thank you 👍
When you're alone I'm reaching out to let you know that you're far from strangers, like the savior

When someone's nickname is very different from their actual name. In Alan Alone, a man introduces himself by saying "My name is Aswadi, just call me... Bai." before hurrying them to listen to his important story to share. But Alan asks why his nickname is so different from his name, which Bai answers that he is nicknamed Bai by those in his village because he likes to eat rambai
.