The movies are Star Wars, Empire, and Jedi. That’s what they’ve been called by everyone, so that’s what they will be called.
The original copyrights I believe are register under SW, TESB, and ROTJ as well, making those the official titles
I won’t discuss it for SW, because this is its original title,under which it was first registered. But for the others, what is the copyright ? TESB and ROTJ were marketed as “SW : TESB” and “SW : ROTJ” but the episode number was originally in the crawl.
Don’t know if this is entirely reliable, but here is imdb card : http://www.imdb.com/title/tt2488496/releaseinfo?ref_=tt_dt_dt#akas
(original title) Star Wars: Episode VII - The Force Awakens
(alternative title) Star Wars: The Force Awakens
TN1 has given us an interesting insight into this. The 1981 craw that they included with their SSE release has the tile of the film in 1981 for UK release as Star Wars Episode IV: A New Hope