Fróilaz is a surname. Notable people with the surname include:
Alfonso Fróilaz (fl. 925), king of the united kingdom of Asturias, Galicia, and León Gonçalo Froilaz, Count of Coimbra Pedro Fróilaz de Traba (fl. 1086–1126), Kingdom of Galicia nobleman Ramiro Fróilaz (fl. 1120–1169), Kingdom of León magnate, statesman, and military leader