O'Day is a surname of Irish origin. Notable people with the surname include:
Alan O'Day (1940–2013), American singer-songwriter Anita O'Day (1919–2006), American jazz singer Aubrey O'Day (born 1984), American singer, dancer, actress, songwriter, fashion designer, former member of the group Danity Kane Caroline Love Goodwin O'Day (1875–1943), American politician Constance O'Day-Flannery, an American author of romance novels Daniel O'Day, one of northwestern Pennsylvania's earliest independent refiners to be brought into John D. Rockefeller's Standard Oil Company Daniel O'Day, Chairman and Chief Executive Officer, Gilead Sciences Darren O'Day (born 1982), Major League Baseball relief pitcher for the Atlanta Braves. Real last name Odachowski, not Irish. George O'Day (1923–1987), American sailor, Olympic champion and boat designer Hank O'Day (1859–1935), American right-handed pitcher, umpire and manager in Major League Baseball Jeremy O'Day (born 1974), offensive lineman for the Saskatchewan Roughriders of the Canadian Football League John O'Day (various people) Marcus O'Day (1897–1961), American physicist Molly O'Day (1911–1998), American film actress Molly O'Day (singer) (1923–1987), American country music vocalist in the late 1940s Nell O'Day (1909–1989), accomplished equestrian and B-movie actress of the 1930s and 1940s Pat O'Day (born 1934), Pacific Northwest broadcaster and promoter
See also Break O'Day Council, a Local Government Area of Tasmania, encompassing the northern part of the states east coast Javits-Wagner-O'Day Act or JWOD, 41 U.S.C. § 46 et seq O'Day Corp., a U.S. sailboat builder of the following sailboats: O'Day 23 O'Day 25 O'Day 28 O'Day 30 O'Day Day Sailer O'Day Mariner, a long sailboat based upon the hull of the Rhodes 19 O'Day (crater), a prominent lunar impact crater that is located on the far side of the Moon O'Dea, Irish surname from which O'Day is derived Peep o' Day Boys, a Protestant secret association in 18th century Ireland, a precursor of the Orange Order
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