I get that naming is one of the hardest problems in computer science, but naming software after a martial art is just lazy and will lead to problems with things like searches
If it helps, they actually named it after their desired CLI abbreviation:
> The command-line tool is called jj for now because it's easy to type and easy to replace (rare in English). The project is called "Jujutsu" because it matches "jj".
I would have spelled it "jiu-jitsu" if I had not looked up the spelling first and found that Wikipedia decided to spell it "jujutsu" (https://en.wikipedia.org/wiki/Jujutsu). Maybe I trusted Wikipedia too much; I have never practiced jujutsu/jiu-jitsu myself.