Family name Flannagan (Flannagan 
) , throughout the world, is quite a rare last name. The surname Flannagan is habitual in Isle of Man, where it is quite a rare surname, New Zealand, and Ireland. Measured by absolute frequency, the name is most common in the United States, the United Kingdom, and Australia.
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| Flannagan | United Kingdom, Canada, Australia, New Zealand, United States |
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catherine flannagan British woman of Irish origin convicted of murder; part of Black Widows of Liverpool (b. 1829) |
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john flannagan American sculptor, US (b. 1895) |
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| john flannagan United States Navy sailor and Medal of Honor recipient, IE (b. 1852) |
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| john flannagan Catholic priest of the Diocese of Davenport who was the second president of St. Ambrose University., US (b. 1860) |
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| john w. flannagan American politician (1885-1955), US (b. 1885) |
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| mary flannagan (1895-1992) (b. 1895) |
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| charlie flannagan Australian rules footballer (b. 1933) |
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| craig flannagan GB (b. 1962) |
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| ronald s flannagan researcher |
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| carrie flannagan researcher |
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| don flannagan college basketball player (1954–1955) Texas Christian |
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| william flannagan Peerage person ID=375256 |
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| flannagan mac ceallach poet |
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| kerry s flannagan researcher (ORCID 0000-0002-1569-2332) |
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| bryan flannagan candidate in the 2021 Scottish Parliament election (b. 1990) |
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