From the moment that Zack Snyder started shooting Justice League Part One, the fans began speculating on the title of the first ensemble movie of the DCEU. With this in mind, and taking into account the possible villain of the movie, several names were dropped, names which can be tracked back to their comic book origins.
Thus, given the extremely obvious Jesus imagery from the already existing DCEU movies, the fans believed that the first Justice League movie will be called Gods among Us, Gods among Men, or Angels and Demons. Obviously, since this is the first Justice League flick, some also said that it will be called simply United, while some said that it will be called Darkseid War, based on the villain most likely to be featured.
Well, none of these titles is the one, since Geoff Johns has revealed the real title of the movie. Thus, on his Twitter account, the producer clarified any misconceptions and said that the movie is simply called Justice League. So, basically, there is no hint about a villain, about a theme, or anything like that.
Clearing up any misconceptions — the Justice League movie is called “Justice League”. @BenAffleck @GalGadot @ZackSnyder Happy Friday!
"” Geoff Johns (@geoffjohns) June 4, 2016
Obviously, the comparison has already been made between the DCEU and the MCU, with the first ensemble movie from that shared universe being called The Avengers. The only difference is made by the definitive article, with some saying that the DCEU will welcome it (the article) when the entire Justice League unites (when Green Lantern finally appears).
This being said, we believe that Justice League is the perfect title and that, even if some comments are sarcastic, this Justice League will become the definitive one sometime soon, with the second part arriving in 2019. For the moment, we are waiting for the Ultimate Edition of Batman v Superman, to see whether Zack Snyder really had an idea about what he was doing.