Monsieur Boulanger was a tavern keeper who used to serve soup made from sheep hooves. And in an attempt to emphasize the restorative properties of the soup on a person's health, he named his soup shop "Restaurant". And this was how the name restaurant came into being.
After Boulanger, several cooks and entrepreneurs began following his idea and began serving up many forms of soups. And this became a ripple effect, leading to the establishment of many restaurants in Paris.