Family name Cosquer (Cosquer 
) , all around the world, is quite a rare surname. The surname Cosquer is habitual in France, where it is quite a rare surname, Belgium, where it is a rare surname, and Portugal, where it is a very rare surname. In absolute terms, it is the most numerous in France, Canada, and Belgium. Very seldom, Cosquer is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Cosquer | China, Belgium, Canada, France, Democratic Republic of the Congo |
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martial testard du cosquer Archbishop of Port-au-Prince, FR (b. 1820) |
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| joachim cosquer FR (b. 1829) |
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patrick lee cosquer American squash player, US (b. 1975) |
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| henri cosquer French professional diver, FR (b. 1950) |
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| jean-luc cosquer French politician, FR (b. 1964) |
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| mireille cosquer researcher, ORCID id # 0000-0002-6674-039X |
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| goulven cosquer researcher (b. 1984) |
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