Cognomen Longstaff (Longstaff 
) , all around the world, is quite a rare family name. The surname Longstaff is habitual in Belize, where it is quite a common surname, Isle of Man, where it is quite a rare surname, and the United Kingdom. In absolute terms, it is the most numerous in the United Kingdom, the United States, and Australia.
| VARIANT | COUNTRY |
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| Longstaff | Canada, Argentina, United Kingdom, United States, Australia |
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george dixon longstaff British physician (b. 1799) |
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sir john longstaff Australian painter (1861-1941), AU (b. 1861) |
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| llewellyn wood longstaff English industrialist and member of the Royal Geographical Society, GB (b. 1841) |
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| george blundell longstaff British entomologist and physician (1849-1921) (b. 1849) |
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| george w. longstaff 19th century American architect, US (b. 1850) |
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| jane longstaff British malacologist, GB (b. 1855) |
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| john longstaff American politician, US (b. 1863) |
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| tom longstaff British explorer (1875-1964), GB (b. 1875) |
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| will longstaff Australian artist (1879-1953), AU (b. 1879) |
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| frederick longstaff Anglo-Canadian soldier, architect, and mountaineer, CA (b. 1879) |
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| bert longstaff English footballer (1885-1969), GB (b. 1885) |
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| leonard william longstaff (b. 1877) |
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| fred longstaff English rugby league footballer, GB (b. 1890) |
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| marion l. longstaff American politician, US (b. 1904) |
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| johnny longstaff anti-fascist activist, GB (b. 1919) |
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