Surname O'Gallagher (O'Gallagher 
) , all around the world, is a rare family name. The cognomen O'Gallagher is habitual in Cayman Islands, where it is quite a rare surname, Ireland, where it is a rare surname, and Australia. Measured by absolute frequency, it is the most numerous in Canada, Australia, and the United States.
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| O'Gallagher | United Kingdom, Canada, Australia, Sweden, United States |
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liam o'gallagher American artist (b. 1917) |
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| marianna o'gallagher Irish-Canadian historian, public speaker, specialist of Irish history in Quebec; former nun and schoolteacher (1929-2010), CA (b. 1929) |
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| john o'gallagher American jazz musician, US (b. 1964) |
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| art o'gallagher Christian Bishop of Raphoe (1547-1558) |
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| owen mactoole o'gallagher Peerage person ID=667511 |
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| kevin o'gallagher researcher |
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| john edward o'gallagher Peerage person ID=544239 |
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| eoin o'gallagher historical figure |
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| michael o'gallagher researcher |
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| niall o'gallagher British journalist, GB (b. 1981) |
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| john o'gallagher CA |
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Mr, Ellen, Quinn, Meagan, Sharon, Alison, Alanne, Ciaran, Bryden, Rhonda, Tracy, Dennis, Daniel, Joseph, Travis, Edward, Fergus, Maritte, Malachi, Michael, Stephen, Deanna, Julie, Jamie, James, Joe, Tom, Ian, Colm, Kyra, Rory, Ruth, Ryan, Lucy, John, Eric, Erin, Zena, Sarah, Shane, Colin, Craig, Brian, Bryan, Kevin, Laura, Caitlin, and Patrick