Blay is a surname. Notable people with the surname include:
Andre Blay (1937–2018), American businessman, film producer and studio executive David Blay Jr. (born 2003), American football player Eddie Blay (1937–2006), Ghanaian boxer Eva Alterman Blay (born 1937), Brazilian sociologist and politician Freddie Blay (born 1942), Ghanaian lawyer and politician George Blay (born 1980), Ghanaian footballer J. Benibengor Blay (1915–?), Ghanaian journalist, writer, publisher and politician Pep Blay (born 1966), Catalan writer, script writer and music journalist Ruth Blay (died 1768), last woman executed in New Hampshire Robert Samuel Blay (1901–1979), Ghanaian judge Philippe Blay (born 1960), French musicologist
See also Blay Whitby, British philosopher and technology ethicist Bley