The first name of the movie character Rambo is John. In the "Rambo" film series, the main character is John Rambo, portrayed by actor Sylvester Stallone. The first film featuring the character was titled "First Blood," released in 1982. John Rambo is a troubled and highly skilled Vietnam War veteran who becomes a central figure in the action-packed franchise. The character's full name is John J. Rambo.