Last name Diard (Diard 
) , worldwide, is quite a rare cognomen. The surname Diard is habitual in France, where it is quite a rare surname, the Republic of the Congo, and Belgium, where it is a rare surname. In absolute terms, it is commonest in France, the Republic of the Congo, and the United States.
| VARIANT | COUNTRY |
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| Diard | Belgium, Canada, France, United States, Republic of the Congo |
| pierre diard French botanist (1784-1849), FR (b. 1784) |
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| pierre-médard diard French naturalist and explorer, FR (b. 1794) |
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| paul diard French official, FR (b. 1833) |
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| louise diard (b. 1830) |
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| maurice diard French novelist (1864-1918), FR (b. 1864) |
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| ennemonde diard French sports journalist, FR (b. 1898) |
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| william diard American opera singer, US (b. 1924) |
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| jean-paul diard French politician, FR (b. 1948) |
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| éric diard French politician, FR (b. 1965) |
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| julien diard researcher |
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| capucine diard researcher (ORCID 0000-0003-2933-4584) |
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| maxime diard French motorcycle rider, FR |
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| caroline diard French searcher |
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| diard médéric r.j. researcher |
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| médéric diard researcher |
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