The word “chauffeur” originally (many years ago) referred to the person who stoked coal in the locomotives of steam trains to propel them forward.
This coal-stoker, the one feeding the fire, eventually became known as the driver, and the term persisted even after the advent of gasoline and electric trains.
The analogy was subsequently extended to all types of vehicles.
https://www.pourquois.com/francais/pourquoi-conducteur-est-chauffeur.html
Hi, I'm Rauf Aliev. 