Jujutsu / Jiu-Jitsu / Ju-Jitsu – Which is the proper spelling?
In Japanese kanji, it is written as 柔術.
柔 being “ju” and 術 being “jutsu”.
This translates into Kana as じゅうじゅつ.
じ - ji
ゅ - yu
う - u
じ - ji
ゅ - yu
つ – tsu
Ji+yu make Jiu / Ju.
“Ju” is used with “Jutsu”.
The correct spelling is “Jūjutsu” and it is pronounced as “Juujutsu” (Joo Joo tsu).
Ju means "pliable, yielding, gentle, soft, supple, flexible."
Jutsu means “art, craft, skill, special feat, method, technique.”
On the other hand Jitsu is something totally different that is unrelated to Martial Arts. The Kanji for Jitsu is 実. It can mean “truth, reality, sincerity” with the Kana being じつ, and it can also mean “fruit, seed, nut, good result” with tha Kana み.
From Wikipedia: "Jujutsu, the current standard spelling, is derived using the Hepburn romanization system. Before the first half of the 20th century, however, jiu-jitsu and then ju-jitsu were preferred, even though the romanization of the second kanji as Jitsu is unfaithful to the standard Japanese pronunciation. Since Japanese martial arts first became widely known of in the West in that time period, these earlier spellings are still common in many places. Ju-Jitsu is still the standard spelling in France, Canada and the United States. The martial art is known as Jiu-Jitsu in Germany and Brazil."