We learn in the film that the name "Rogue One" refers to the callsign of the squad that went to capture the plans for the Death Star. Since the film revolves around the origin story of this odd rag-tag group of rebels, naming the film after them seems most appropriate.
The name apparently resonated with the film's director, Gareth Edwards for a number of different reasons, referring to the film, the call sign of the unit but also the main character Jyn Erso.
"I'd been thinking about it,” he reflects in the new issue of Empire. “What does it mean? 'Rogue One’ is a military call sign to some extent,” he adds, referring to Red Squadron during the Battle of Yavin, "but this is the first film that's gone off-piste and is not part of the saga – or the Anakin story – so it’s the 'rogue' one, you know?”
There’s potentially another meaning to it too, relating to Felicity Jones’ interplanetary guerrilla Jyn Erso. She also has a rogue streak; a touch of the Han Solos in her drive to do what’s right, regardless of how much shit she has to blow up en route. “It's kind of describing her as well in a similar way,” says Edwards. “It has [all] these split, multiple meanings that made it feel like the right choice."
Exclusive: Rogue One’s Gareth Edwards explains the movie's title