Wikipedia has some background on the spelling: https://en.wikipedia.org/wiki/Jujutsu#Etymology
> Jujutsu is derived using the Hepburn romanization system. Before the first half of the 20th century, however, jiu-jitsu and ju-jitsu were preferred,
> Jujutsu is derived using the Hepburn romanization system. Before the first half of the 20th century, however, jiu-jitsu and ju-jitsu were preferred,
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