Who is buttons in Cinderella?

There is no character named Buttons in the classic story of Cinderella. However, there is a male character named Jaq, who is transformed into a human carriage driver with the help of magic. Other characters in the story include Cinderella, the Fairy Godmother, Prince Charming, Lady Tremaine, and Anastasia and Drizella, Cinderella's stepsisters.