Last name Demorest (Desmarais 
, Demorest 
) , across the world, is a common cognomen. The family name Demorest is habitual in Mauritius, where it is quite a common surname, Canada, and New Zealand, where it is quite a rare surname. Not in comparison with a country's population, this name is the most popular in the United States, Canada, and France.
| VARIANT | COUNTRY |
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| Desmarais | France, Canada, United States, Mauritius, New Zealand |
| Demorest | France, Canada, United Kingdom, United States, Brazil |
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william jennings demorest American activist and journalist, US (b. 1822) |
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| kirk demorest filmmaker (b. 1901) |
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| stephen demorest American screenwriter, US (b. 1901) |
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| nelson demorest animator (1906-1992), US (b. 1906) |
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| max harrison demorest American earth scientist (1910-1942), US (b. 1910) |
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| demorest davenport biologist (b. 1911) |
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| jean-jacques demorest French scholar of French literature, FR (b. 1920) |
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jude demorest American actress and singer, US (b. 1992) |
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| steven m. demorest music education professor (1959-2019), US (b. 1959) |
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| paul demorest researcher, ORCID iD = 0000-0002-6664-965X |
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| shanda demorest researcher (ORCID 0000-0003-3763-8131) |
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