List of Famous people with last name O-day

Aubrey Morgan O'Day is an American singer-songwriter and reality television personality, best known for being a member of the girl group Danity Kane. Following discord among Danity Kane and with her mentor at the time, P. Diddy, O'Day was fired from the group in 2008, but reunited with them in 2013 before a second disbandment. Danity Kane reunited in 2018 as a trio. She has also performed in the duo Dumblonde with former Danity Kane bandmate Shannon Bex since 2015.

Molly O'Day was an American film actress and the younger sister of Sally O'Neil.

Anita Belle Colton, known professionally as Anita O'Day, was an American jazz singer and self proclaimed “song stylist” widely admired for her sense of rhythm and dynamics, and her early big band appearances that shattered the traditional image of the "girl singer". Refusing to pander to any female stereotype, O'Day presented herself as a "hip" jazz musician, wearing a band jacket and skirt as opposed to an evening gown. She changed her surname from Colton to O'Day, pig Latin for "dough", slang for money.