JoJo

JoJo (ジョジョ, lit. JoJo) is a nickname shared by each of the main protagonists of JoJo's Bizarre Adventure, derived from the recurrence of "Jo" in their names.

In the text of the manga during Part 1 and Part 2 it is used most frequently in reference to Jonathan and Joseph Joestar.

With the tentative exception of JoJolion's Josuke, each of the protagonists is also descended from the Joestar family; while all bear the Joestar birthmark.

Non-Main protagonists
The following characters are not main protagonists in the series, but since their names can also result in "JoJo" when shortened, they may also be considered "JoJos":
 *  Geo rge  Jo estar I
 *  Geo rge  Jo estar II
 * Holy  Jo estar-Ku jo  (in the context of her maiden surname and husband's surname)
 * Norisuke Higashikata IV (born Josuke)
 *  Jo sefumi Ku jo 
 * Jesus (Joshua bar Joseph)

Origin
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. 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.