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 masculine 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