Cognomen Defaix (Defaix 
) , in all the world, is a rare surname. The family name Defaix is habitual in France, where it is a rare surname, Netherlands, and Brazil, where it is a very rare surname. Much less frequently, Defaix is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Defaix | France, Netherlands, Brazil |
| jean-jacques defaix FR (b. 1947) |
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| antoine defaix researcher |
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| thierry defaix Ph.D. Université Rennes I 1996 |
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