Cognomen St-Jean (St-Jean 
) , all over the world, is quite a rare last name. The surname St-Jean is habitual in Canada, where it is quite a rare surname, New Zealand, and Belgium, where it is a very rare surname. Measured by absolute frequency, the name is most common in Canada, New Zealand, and the United States. Parts of the name also exists independently as a first name Jean.
| VARIANT | COUNTRY |
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| St-Jean | Belgium, France, United States, Canada, New Zealand |
| roger st-jean Canadian photographer, CA (b. 1917) |
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| claude st-jean CA (b. 1954) |
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| audray st-jean researcher |
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| st-jean m researcher |
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| gilles st-jean researcher |
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| philippe st-jean researcher |
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| lunie st-jean Haitian association football player, HT |
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| samuel st-jean researcher, ORCID id # 0000-0002-8092-2974 |
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| jules st-jean actor |
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| kévin st-jean Quebecois political candidate, CA |
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| étienne st-jean Quebecois political candidate, CA |
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| guillaume st-jean researcher (ORCID 0000-0003-2112-9113) |
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| richard st-jean performing artist in Canada |
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| jérôme st-jean Quebecois political candidate, CA |
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| mireille st-jean researcher (ORCID 0000-0002-7863-9387) |
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