The Formal title for this display in Japan is "Fullmetal Alchemist" which was renamed as "Fullmetal Alchemist: Brotherhood" from the English version. The key reason why to the renaming was to avoid baffling it with the initial series which also shared the same title. Inside of a survey from Oricon https://fullmetalalchemistbrother88147.blogocial.com/The-smart-Trick-of-Fullmetal-Alchemist-Brotherhood-That-Nobody-is-Discussing-47651789