In Waiting for Godot," why does the playwright name a character "Lucky" when he isn't?

Beckett wrote Lucky on purpose- after all, no playwright writes anything by accident. Lucky is meant to be compared to the likes of Vladimir and Estragon, who are caught in limbo. Because Lucky is out of this limbo, it can be said he is indeed lucky- he does not have to repeat the process of waiting that Vladimir and Estragon have to repeat. Lucky always has a definite role within the text. Even though this role is being a slave and puppet under Pozzo, he always has a task to complete. This is why Beckett named Lucky, well, Lucky, as it draws attention to the fact that Vladimir and Estragon are forever waiting- after all, '"Nothing ever changes, no one ever comes, it's awful!"