From CNA:
Many know Ferrero Rocher for its popular hazelnut chocolates, but the company’s tie to Our Lady of Lourdes is lesser known.
Michele Ferrero, the company’s founder and a devout Catholic, had a deep devotion to the Blessed Virgin Mary and wanted to honor her through his work. It is reported that he named his company “Rocher” after the rock grotto, the Rocher de Massabielle, which marks the location where the Virgin Mary appeared to St. Bernadette in Lourdes, France.