Zeppo Marx that "Herbie" was tagged with the name "Zippo" because he liked to do chinups and acrobatics, as the chimp did in its act. The youngest brother objected to this nickname, and it was altered to "Zeppo". In a TV Interview, Zeppo said that Zep is Italian-American slang for baby and as Zeppo was the youngest or baby Marx Brother he was called Zeppo. Zeppo replaced brother Gummo in the Marx Brothers stage act when the latter joined the army in 1918. Zeppo remained with the team and appeared in their successes in vaudeville, on Broadway and the first five Marx
Harpo Marx was occasionally referred to by the other Marx Brothers, who were careful to imply that his character's not speaking was a choice rather than a disability. They would make joking reference to this part of his act. For example, in "Animal Crackers" his character was ironically dubbed "The Professor". In "The Cocoanuts", this exchange occurred: In later films, Harpo was put into situations where he would repeatedly attempt to convey a vital message to another person, but only did so through nonverbal means, usually by whistling or pantomime. These scenes reinforced the idea that the character was unable to speak.