Lays is one of the largest chip brands in the United States. In other parts of the world, Frito-Lay (a subsidiary of PepsiCo) uses different brand names. In Australia, it's known as Smith's. In Colombia, it's known as Margarita. What is the Lays brand name used in the UK and Ireland? Their flavors include Pickled Onion, Prawn Cocktail, and Marmite.