Surname Nadeau (نادو 
, Nadeau 
, Надо 
) , all around the world, is a common cognomen. The last name Nadeau is characteristic of Canada, where it is quite a common surname, New Zealand, and the United States, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Canada, the United States, and France. Very seldom, Nadeau is the forename as well as the last name.
| VARIANT | COUNTRY |
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| نادو | Saudi Arabia, Syria, Algeria, Egypt, Iraq |
| Nadeau | Japan, United States, Canada, France, New Zealand |
| Надо | Kazakhstan, Russia |
| alexis nadeau 1695 Beaumont, Bellechasse, Québec - (b. 1695) |
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| joseph nadeau French military personnel (1698-1760), CA (b. 1698) |
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| claire nadeau 15 Feb 1730 Kamouraska, Québec - 5 Feb 1814 Kamouraska, Québec (b. 1730) |
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| marie catherine nadeau 15 Jul 1742 Kamouraska, Québec - (b. 1742) |
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| louis nadeau (b. 1822) |
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| mathias nadeau Canadian politician (1838-1919), CA (b. 1838) |
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| zephirin nadeau (b. 1840) |
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maurice nadeau French writer, FR (b. 1911) |
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| mary lucy dumond nadeau (b. 1860) |
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| epiphane p. nadeau Canadian politician, CA (b. 1879) |
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robert nadeau American academic, CA (b. 1944) |
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| gary nadeau Film director, screenwriter, US (b. 1901) |
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| jean-marie nadeau Canadian lawyer (1906-1960), CA (b. 1906) |
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| gabriel nadeau CA (b. 1900) |
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| docithe nadeau Canadian politician, CA (b. 1910) |
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