Family name Coüasnon (Coüasnon 
) , in the world, is an extremely rare cognomen. The last name Coüasnon is characteristic of Western Europe, particularly France, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Coüasnon | France |
| charles coüasnon French architect, FR (b. 1868) |
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| henry coüasnon French architect (1910-1983), FR (b. 1910) |
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| charles coüasnon FR (b. 1904) |
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