Last name Harnois (Harnois 
) , around the globe, is quite a rare cognomen. The family name Harnois is habitual in France, where it is quite a rare surname, Canada, and New Zealand, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in France, the United States, and Canada.
| VARIANT | COUNTRY |
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| Harnois | Canada, Philippines, France, New Zealand, United States |
| charles harnois FR (b. 1779) |
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elisabeth harnois American actress, US (b. 1979) |
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marlène harnois Taekwondo practitioner, FR (b. 1986) |
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jessica harnois CA (b. 1979) |
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| gaston harnois (b. 1933) |
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| jean-yves harnois French politician, FR (b. 1947) |
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| carmen harnois researcher and professor at Université Laval (b. 1953) |
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| béatrice harnois French actress, FR (b. 1955) |
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| maxime harnois researcher ORCID ID = 0000-0002-4687-5000 (b. 1981) |
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| marcel harnois CA |
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| jérôme harnois |
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| vincent harnois |
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