There’s has been a lot of debate as to whether the “Jedi” in Star Wars: The Last Jedi’s title is a singular or plural use. It seems we now have an answer, that is if the localization teams did their jobs correctly.
In German, the words for “The Last” help denote whether the “Jedi” is used as a singular or plural. Thanks to IGN Germany, the newly revealed German title – “Die Letzten Jedi” – uses the plural version, meaning it references multiple Jedi (if it was singular, it would be “Der Letzte Jedi”).

Now this doesn’t reveal who the last Jedi are. The simplest answer would be Luke and Rey, but many are theorizing Kylo Ren’s return to the Light Side and an eventual switch to the Dark Side for Rey.