Now that we've seen the film, the most obvious interpretation of the title is that it foreshadows the final line of the movie, when Rey returns to Tatooine to bury Luke and Leia's lightsabers and answers a stranger who asks her name by saying "Rey Skywalker." Throughout the entire sequel trilogy, Rey has been front and center, and this movie finally lets her "rise" to the status of a full-fledged Jedi hero. Since the whole trilogy has largely been about her rise from "nobody" scavenger to Jedi and hero of the whole galaxy, it makes sense that it's her "rise" that's talked about in the title. After all, she is literally told to "rise" by the spirits of the fallen Jedi in the Force.
By the end of the movie, the Skywalker bloodline has died out and "fallen," but when Rey takes the name to honor her beloved mentors, it "rises" again. It's the last line of the movie, signaling that it's incredibly important, so it's a fair interpretation that the title refers to Rey.
