Family name Cosnac (Cosnac 
) , around the world, is a very rare surname. The surname Cosnac is habitual in Western Europe, particularly France, where it is a rare surname, and Germany, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Cosnac | Germany, France |
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daniel de cosnac FR (b. 1628) |
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| gabriel de cosnac FR (b. 1649) |
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| daniel de cosnac FR (b. 1700) |
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| jean-joseph-marie-victoire de cosnac FR (b. 1764) |
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| gabriel-jules de cosnac French historian, FR (b. 1819) |
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| bettina de cosnac German journalist and author, DE (b. 1960) |
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| bertrand de cosnac bishop of the Roman Catholic Church |
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| pierre de cosnac bishop of the Roman Catholic Church |
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