Dorothy Gale is a fictional character created by American author L. Frank Baum as the main protagonist in many of his Oz novels. She first appears in Baum's classic children's novel The Wonderful Wizard of Oz (1900) and reappears in most of its sequels. In addition, she is the main character in various adaptations, notably the classic 1939 film adaptation of the novel, The Wizard of Oz.

Is it true that did dorothy from wizard of oz have a last name?
yes