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Anime and Manga
- Elfen Lied features experimental subject Number Seven, or "Nana" as her father figure calls her.
- Loveless has a Hikikomori called Nana who only briefly shows up in the anime but plays a larger part in the manga, and her name likely refers to her dependence on computers. She's referred to as "Seven" in the Tokyopop manga release... until volume eight, when they switch to Nana.
- Both stars are named Nana in the manga Nana, and live in apartment 707 — effectively using this trope as its entire premise. One of them is called "Hachi" (short for Hachiko, but also meaning eight) to differentiate between them.
- In Shichinin no Nana (Seven of Seven)note , a girl named Nana is split into seven personality fragments.
- And all those fragments get names that describe them and start with Nana. The exception is the eighth, bad Nana, Jamanana.
- Best of all, the primary Nana's Japanese voice actor is also named Nana (Nana Mizuki, as a matter of fact).
- In Puni Puni Poemi, the seven Aasu sisters are all named after numbers, in reverse age order. So the youngest sister is named Hitomi (from "hito" - one), and the oldest is named Nanase.
- Kodomo no Omocha's Sana is named after her birthday, March 7.
- In Katekyo Hitman Reborn! Tsuna is occasionally associated with the number 27. It's on his door, as well as the mitten form of his X gloves. Tsu sounds like two, and na is seven. Thus, 27. Made cuter by the fact that his mother's name is actually Nana and his father is Iemitsu. The last syllables of their names makes Tsuna's name.
- Saki of Futari Wa Pretty Cure Splash Star is associated with flowers (hana); naturally, her birthday is August seventh (ha - eight, na - seven).
- Nanaho Kinjou in Best Student Council is the seventh child of the Kinjou family. Her Killer Yo-Yo has a seven emblazoned on it, and one of her blouses has a seven on it as well. Taking the number theme further, her nickname for her six older brothers are their birth numbers.
- In Othello, Nana receives a mix tape with "For 7" on it. She then realizes it means "For Nana".
- The main protagonist in Battle Royale is Shuya Nanahara, nicknamed 'Wild Seven' because of his surname.
- In Area no Kishi, Nana Mishima, a.k.a "Seven", was referred to by her elementary school football jersey number, which just so happened to be "7".
- Nanami in the name Lucia Nanami means "seven seas".
- Playing off the all ready established pun of "Nonoriri" referring to Noriko, Nono is also a pun by bring next to "nana" as she is Buster Machine Number 7.
- Nanael from Queen's Blade also counts, since almost all the angels from that series are named after numbers with the Hebrew suffix "-el" included. (Her best friend and senior, Hachiel, has number eight as her prefix in her name.)
- TV Tokyo's current mascot is a banana shaped liked the number seven (referring to their channel number) called Nanana.
- In Cross Ange, Ange hoards this trope. Voiced by Nana Mizuki, her Vilkiss has a 7 on it, and the jersey she wore during the sports episode in episode 16 has her wearing a number 7 (same thing with the race car she used and the hole in one shot she made was hole number seven).
- Mega Man X: Command Mission has a Reploid named Nana as your Mission Control, with the number seven displayed prominently on each of her breasts.
- There are two examples in Tsukihime:
- Early in the game, Shiki gets a knife engraved with kanji. Assuming they represent words, he reads them as "Seven Nights". They're actually a name: Nanaya, which is the name of Shiki's real family.
- Nanako in Kagetsu Tohya. Originally... well, not quite originally since she was a human once with a presumably human name. Er. Anyway, previously, her name was Seven, in English, as she's the spirit of the Seventh Scripture; a fusion weapon created from her soul and the horn of a unicorn monster. Arihiko translates that to Japanese, Nana, and then adds a feminine ending to it. There, Nanako the horsegirl, spirit of a BF Harpoon Gun that shoots pages of the Bible. Yep.
- Higurashi: When They Cry gives us Rena, which is one reading for the characters for 0 and 7 and a reference to the name of the creator, Ryukishi 07. Reina would be a more commonly expected reading for 07, and that turns out to be Rena's original given name.]
- The title of Nanashi no Game can mean na-nashi no game - the game with no name, and that is the primary meaning. However, it can also mean nana-shi no game - the seven-death game, as in the game that kills you in seven days.
- "Na na na" in a song is sometimes shown as the Arabic number 7 in karaoke. One example of this is Konjiki no Gash Bell's sixth ending.
- Nana Mizuki milks this trope for all it's worth with her singing career.
- She charges $77 for her concert tickets.
- She voices the Windows 7 OS-tan, Nanami Madobe (her names meaning "seven"(-mi) and "by the window"). Nanami can mean 777 too, so 777 by the window.
- She voices another Nanami in Dog Days.