* Examples from Fanfic/{{the Calvinverse}}:
** ''Fanfic/CalvinAndHobbesIIIDoubleTrouble'' has two characters named Rupert Chill - one human, one alien. The human Chill goes by his last name to avert confusion.
** Dr. Brainstorm of ''Fanfic/CalvinAndHobbesTheSeries'' [[InvokedTrope insists on this.]] [[DefiedTrope It does]] [[DoNotCallMePaul not work.]]
* ''FanFic/BecauseImNotPopularIllTryToGoOutWithAHero'' has Venom only refer to Peter by his last name.
* In the Fanfic/Gensokyo20XX series, we have this to somewhat the case with Mokou who is nicknamed "Huzi", being that her last name, Fujiwara, is alternatively pronounced and spelled Huziwara, leading for her nickname to be Huzi and she is usually referred to as such. Apparently, an age-regressed Reimu thinks her first name is her last name.
* At least one ''Franchise/MassEffect'' [[JustifiedTrope justifies]] Commander Shepard only being called by their rank or last name by explaining that no one (Shepard included) actually knows their first name.
* Chiyo Ueda, Arata Miyazaki, and Kazumi Katsuya of ''FanFic/DespairsLastResort'' all do this. Chiyo does it out of politeness, while the other two out of rudeness. Chiyo makes an exception for her ChildhoodFriend Kumiko. [[spoiler: After Shizuka's death, Kazumi refers to her by first name. Arata calls Takara by her first name after she figures out his crime, but it doesn't last long since he gets executed.]]
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