JoJo (ジョジョ) is a nickname shared by each of the main protagonists of JoJo's Bizarre Adventure, derived from the recurrence of "Jo" in their names.
|Jonathan Joestar||Joseph Joestar||Jotaro Kujo|| Josuke|
|Giorno Giovanna||Jolyne Cujoh||Johnny Joestar||Josuke Higashikata (JoJolion)|
The following characters are not protagonists in the series, and some do not even belong to the Joestar bloodline. However, it's notable that their names are able to be shortened as "JoJo":
- George Joestar I (ジョージ・ジョースター Jōji Jōsutā)
- George Joestar II (ジョージ・ジョースター 2世 Jōji Jōsutā Nisei) (or Jorge Joestar in his novel)
- Holy Joestar-Kujo (in the context of her maiden surname and husband's surname)
- Sadao Kujo (the first character in his first name can also be read as Jo; see )
- Shizuka Joestar (her first name can also be read as Jo)
- George Joestar I (Steel Ball Run)
- George Joestar II (JoJolion)
- Norisuke Higashikata IV (born Josuke)
- Josefumi Kujo
- Sadafumi Kujo
- Joe Kujo
In the case of Josuke Higashikata, the second kanji of his name, 助 (Suke), may also be read as Jo (ジョ), giving him the alternate-yet-unused name of "JoJo Higashikata".
Araki admits that the idea for the name came from his neighborhood's local Jonathan's restaurant where he and his editor would often hold midnight meetings. The two decided the protagonist's first name would be Jonathan, and Araki, using Steven Spielberg's name as a reference, decided the last name should follow the same format, and thus Joestar was decided. (Steven Spielberg's name in Japanese is スティーブン・スピルバーグ, or "SUtiiben SUpirubaagu" - thus the SuSu/JoJo format) Araki mentions that it was risky using this type of name, as using a foreign name for a main protagonist at the time was considered taboo.
Araki also admits that stories such as East of Eden and the TV series Roots inspired him to use a periodical style where the main character changes, but the story continues; although this was not a very Jump-style format for manga at the time.