O'Day is a surname of Irish origin. Notable people with the surname include:
- Alan O'Day (1940âÂÂ2013), American singer-songwriter
- Anita O'Day (1919âÂÂ2006), 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 (1875âÂÂ1943), 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 (1923âÂÂ1987), American sailor, Olympic champion and boat designer
- Hank O'Day (1859âÂÂ1935), 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 (1897âÂÂ1961), American physicist
- Molly O'Day (1911âÂÂ1998), American film actress
- Molly O'Day (singer) (1923âÂÂ1987), American country music vocalist in the late 1940s
- Nell O'Day (1909âÂÂ1989), accomplished equestrian and B-movie actress of the 1930s and 1940s
- Pat O'Day (born 1934), Pacific Northwest broadcaster and promoter
See also
References