It's actually really interesting, because the kanji for JJK can be translated several different ways, depending on if you're going for an archaic or modern reading. From my limited Japanese understanding, it's interpreted as "Endless Sorcery Fight/Combat" the way it's written (and the Chinese fans also read it a similar way), but it's kind of a weird title, even in Japanese.

Honestly, JJK has me reaching for my literary kanji dictionary a lot with it's ability titles, Sukuna's domain literally being "Malevolent Kitchen" had me "???" the first time I read the raws, lol. But can't say it's not educational as a 2nd language learning experience.