There's some interesting trivia about Dopey:
* Originally, Dopey was supposed to talk. But during production, it was decided that having a silent dwarf would add humor and visual interest.
* The animators gave Dopey a distinctive appearance. He has big eyes, a small nose, and a wide, open mouth, which amplifies his silly expressions.
* Dopey's character is often seen as the most endearing. His childlike innocence and love for Snow White make him a popular character with audiences of all ages.
So, Dopey is called Dopey because his lack of speech and his silly, clumsy nature make him the most easily identifiable dwarf in the group.