There are a few people who believe Luke is the last jedi. However, some say there are multiple jedi left, since jedi can be expressed as more than one. Others say either Rey, or even crazier that Kylo Renn is the last jedi. What do you think?
I saw somewhere that the grammatical structure of the official Slovenian translation of the title suggests that “Jedi” is indeed singular in this case (not speaking Slovenian, I can’t really weigh in myself). Anyway, I think it just refers to Luke at this particular point on the timeline. I don’t think that it has to preclude the possibility of more Jedi later on; Luke is simply the last Jedi as of his meeting with Rey in 35 ABY (or whatever it is). Anything can happen when the story progresses.