Brett is an Irish and English surname that was given to the Celtic peoples of Brittany who arrived during the Norman invasion of England and Norman invasion of Ireland respectively. . The given name Brett derives from the surname and can be either masuline or feminine . People with the surname. Adrian Brett (born 1945) English flutist and writer. Agnes Baldwin Brett (1876–1955), American numismatist. Bill Brett, Baron Brett (1942–2012), English politician and businessman. Bob Brett (1953−2021), Australian tennis coach. Brian Brett (speedway rider) (1938–2006), English speedway rider.
https://en.wikipedia.org/wiki/Brett