In the movie, it's called Devastator. This was a mistake, it was supposed to be Brawl (a homage to the G1 Combaticon). The toy is called Brawl. Here is the explaination according to Wikipedia:
''There is some mix-up over his name: the toys and video games list his name as Brawl, but in the film itself, and the official movie novelization, his name is Devastator. He refers to himself as Devastator in the movie subtitles. According to Roberto Orci, one of the writers of the movie, and Hasbro's Transformers team, "Devastator" is the mistake, and that the character is supposed to be named Brawl. The official names of all the Transformers seen in the film were confirmed in August 2006, nearly a year before the film's North American release date. However, director Michael Bay was not fully aware of these names and sometimes referred to some of them by their "on-set names". (He said in an interview, that he often referred to Frenzy as "Soundbyte".) Thus, on-set he would refer to the tank Decepticon as "Devastator". Somehow, the name made its way into the final cut of the film. Director Michael Bay favored the name Devastator, as he felt that it sounded more threatening than Brawl. [2] The early leaked script Prime Directives had him named Devastator, as does the Titan U.K. magazine. Concept art for the character named him "Demolishor", as the name Brawl (in concept art) went to Barricade. In Transformers: Revenge of the Fallen, the name "Devastator" is given to the robot created from the combining Constructicons, as is the case in previous Transformers continuities.''
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