Family name Gagnon (Gagnon 
, جانون 
) , around the world, is a common cognomen. The cognomen Gagnon is habitual in Canada, where it is a common surname, New Zealand, where it is quite a common surname, and Eswatini. Measured by absolute frequency, it most frequently occurs in Canada, the United States, and New Zealand. Much less frequently, Gagnon is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gagnon | France, Canada, Democratic Republic of the Congo, United States, New Zealand |
| جانون | Iraq |
| geneviève gagnon 4 Mar 1672 Cap Tourmente, Québec - 28 Apr 1749 Château-Richer, Montmorency, Québec (b. 1672) |
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| alexandre gagnon 6 Jan 1683 Beaupré, Québec - 23 May 1752 Québec (b. 1683) |
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| marie françoise gagnon 20 Apr 1719 La Pocatière, Québec - (b. 1719) |
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lucien gagnon Quebec revolutionary (b. 1793) |
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| alexandre gagnon 1746 - (b. 1746) |
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| marie louise gagnon 18 Apr 1757 Ste Anne de Beaupré, Québec - (b. 1757) |
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ernest gagnon composer (1834-1915), CA (b. 1834) |
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gustave gagnon Canadian musician, CA (b. 1842) |
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charles-antoine-ernest gagnon Canadian politician, CA (b. 1846) |
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philéas gagnon Canadian book collector, CA (b. 1854) |
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| adolphe gagnon Canadian politician, CA (b. 1810) |
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alphonse-osias gagnon Catholic bishop, CA (b. 1860) |
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bert c. gagnon American actor-manager, US (b. 1874) |
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| léonard constant gagnon FR (b. 1817) |
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henri-louis gagnon Canadian politician, CA (b. 1881) |
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