What is "l'entrecote"

Around the world, many restaurants featuring steak dishes use the word entrecôte as their name or part of their name. In particular, the name L'Entrecôte has come to identify three iconic groups of restaurants owned by two sisters and one brother of the Gineste de Saurs family, which specialise in the contre-filet cut of sirloin and serve it in the typical French bistro style of steak-frites, or steak-and-chips:

• L'Entrecôte is the popular nickname of the restaurant Le Relais de Venise – L'Entrecôte, founded by Paul Gineste de Saurs in Paris's 17th arrondissement near Porte Maillot. Now run by one of his daughters, the restaurant is widely known as L'Entrecôte Porte-Maillot. It has six additional locations operating under licence, four in London, one in Bahrain, and one in New York.
• L'Entrecôte is the legal name of a group of restaurants established by a son of Paul Gineste de Saurs, with locations in Toulouse, Bordeaux, Nantes, Montpellier, and Lyon.
• L'Entrecôte is also the popular nickname for the Le Relais de l'Entrecôte restaurants operated by another daughter of Paul Gineste de Saurs, with three locations in Paris and one in Geneva. The oldest of these, in Paris's 6th arrondissement, is widely known as L'Entrecôte Saint-Germain. This group has seven additional locations operating under licence, two in Beirut and one each in Kuwait City, Doha, Dubai, Riyadh, and Hong Kong.