The official title for this show in Japan is "Fullmetal Alchemist" which was renamed as "Fullmetal Alchemist: Brotherhood" from the English Model. The key reason why to the renaming was to stay away from confusing it with the initial sequence which also shared the exact same title. After Mustang agrees https://fullmetalalchemistbrother89012.blogzag.com/57832102/not-known-facts-about-fullmetal-alchemist-brotherhood