Answer:
Atticus Finch's surname is important because it symbolizes his moral character and integrity throughout the novel. It serves as a reminder that, despite being raised in a racist and prejudice Deep South, Atticus has a moral foundation which allows him to stand up for what he believes in and makes him an exemplary father, husband, and citizen. His integrity is represented by the attributes of a finch - a small songbird with a proud demeanor, implying that, like the finch, Atticus is strong in his convictions despite a hostile environment, and is a model of justice in a society marred by racial inequality.