Surname Gallais (Gallais 
) , globally, is quite a common last name. The surname Gallais is habitual in Jersey, where it is quite a common surname, France, where it is quite a rare surname, and Hong Kong, where it is a rare surname. Not in comparison with a country's population, it is commonest in France, the United Kingdom, and Canada.
| VARIANT | COUNTRY |
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| Gallais | United Kingdom, Canada, France, Hong Kong, Switzerland |
| jean-pierre gallais French journalist and historian, FR (b. 1756) |
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| étienne-marie gallais French Dominican missionary (1851-1907) (b. 1851) |
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pierre gallais French medievalist, FR (b. 1929) |
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| fernand gallais French chemist, FR (b. 1908) |
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| jean gallais French writer (1926-1998), FR (b. 1926) |
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xavier gallais French actor, FR (b. 1976) |
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| gisèle gallais FR (b. 1931) |
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| jean-marie gallais French politician, FR (b. 1942) |
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| raymond gallais French politician, FR (b. 1948) |
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| martine gallais French politician, FR (b. 1955) |
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| daniel gallais (b. 1951) |
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| goulven gallais FR (b. 1961) |
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| laurent gallais researcher ORCID ID = 0000-0002-6806-4313 (b. 1976) |
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| mary denise le gallais Peerage person ID=456346 |
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| benjamin gallais researcher |
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