Frequently in the novel Nostromo is referred to as a "man" in some superlative
or meaningful sense. Contrast, for example, his innocently egotistic claim that
he is "a man" ,
and the later frown of discontent that makes him a "man" in the narrator's
eyes.
The very name Nostromo is based on nostro uomo, "our man." The
references reinforce the sense of Nostromo as the prototypical common man: the
People.