Surname Gahan (Gahan 
, Гон 
, גהאן 
) , across the world, is a common cognomen. The family name Gahan is characteristic of Ireland, where it is quite a common surname, Kazakhstan, where it is quite a rare surname, and Malaysia. Measured by absolute frequency, the name is most common in India, the United States, and Ireland. Much less frequently, Gahan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gahan | Ireland, United Kingdom, United States, India, Malaysia |
| Гон | Ukraine, Kazakhstan, Russia, Azerbaijan, Kyrgyzstan |
| גהאן | Israel |
| Гаан | Ukraine, Kazakhstan, Russia, United States, Kyrgyzstan |
| william gahan Irish writer and priest (b. 1732) |
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| george gahan British Royal Navy officer, lieutenant in 1815 (1794-?) (b. 1794) |
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thomas gahan American politician, US (b. 1847) |
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| charles joseph gahan Irish entomologist, IE (b. 1862) |
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| bessie grace gahan grandmother of Marlon Brando, US (b. 1876) |
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| arthur burton gahan American entomologist (1880-1960), US (b. 1880) |
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gahan wilson American cartoonist (1930-2019), US (b. 1930) |
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| george wilkie gahan (b. 1871) |
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| john harvey gahan Canadian musician (1888-1958), CA (b. 1888) |
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| frank gahan British QC, GB (b. 1890) |
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| muriel gahan Irish activist (b. 1897) |
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| james bonnet gahan American entomologist, US (b. 1909) |
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| margaret emily horn gahan American housewife, US (b. 1910) |
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| winifred gahan American statistician with the USDA, US (b. 1910) |
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| george thomas gahan Australian politician and Victorian amateur boxer (1912-1980), AU (b. 1912) |
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