Cognomen Gannon (Mag 
, Gannon , جانون 
) , worldwide, is a common last name. The surname Gannon is characteristic of Guernsey, where it is quite a common surname, Ireland, and Hungary. In absolute terms, it is the most numerous in India, the United States, and Ireland. Very seldom, Gannon is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Mag, Gannon | India, Australia, United States, United Kingdom, Ireland |
| جانون | Iraq |
| 甘农 | China |
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mary gannon American actress (1829-1868), US (b. 1829) |
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john gannon Politician and solicitor in New South Wales, Australia, AU (b. 1830) |
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michael gannon Australian politician, AU (b. 1847) |
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| michael gannon (1800-1881) builder and innkeeper (b. 1800) |
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james gannon politician and barrister in New South Wales, Australia (1859-1924), AU (b. 1859) |
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mary nevan gannon American architect (1867–1932), US (b. 1867) |
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| harriette mary gannon (b. 1835) |
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| john patrick gannon Irish farmer and writer, IE (b. 1856) |
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| bill gannon American baseball player, US (b. 1873) |
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| gussie gannon American baseball player (1873-1966), US (b. 1873) |
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| john mark gannon Catholic archbishop, US (b. 1877) |
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| joe gannon American baseball player (1877-1931), US (b. 1877) |
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| jack gannon Irish cricketer and British Army officer (1882-1980), GB (b. 1882) |
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| chester m. gannon American politician, US (b. 1888) |
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| patrick joseph gannon (b. 1879) |
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