There's only one film I'm interested in and it came out in 1977. I use the title that was in the theater when I was 15 and on the one-sheet I had hanging on the wall in my bedroom - Star Wars.
If a person I'm speaking with asks which film I'm talking about, then we're most likely not on the same wavelength anyway, so we should move on to a different topic. I occasionally refer to it as Star Wars77, but only if I'm trying to address a certain time frame or version.
My go-to for Star Wars, the NPR version, also refers to it by its original, singular title - Star Wars. That's all there is in my world.