Shazam (the movie) was originally meant to feature Dwayne "The Rock" Johnson as the villain, Black Adam.
SHAZAM SINBAD MOVIE
It's doubtful that Warner Bros plans to attempt to explain to casuals why they have a hero named after an upcoming Marvel movie starring in a movie called something different, so they're probably just going to go with flow and call him Shazam in the film, just like everyone else will. Shazam was originally known as Captain Marvel, but trademark shenanigans allowed Marvel Comics to use the name for their own superhero, who has her own movie coming out in 2019 starring Brie Larson. However, Shazam (the wizard) cannot be blamed for Billy Batson turning into Shazam (the superhero) when he says "shazam" (the magic word) in Shazam (the movie).
It's unknown why the wizard Shazam is so insecure that he chose his own name to also be used as his magical word. Shazam is a movie about a boy named Billy Batson, who says the magical word "shazam" and is imbued with magical powers from a wizard who is also named Shazam. Sandberg is reportedly in talks with New Line to direct the upcoming DC Cinematic Universe film Shazam, according to a report from sandwich-themed Hollywood gossip website The Wrap.