Cognomen Derbaix (Derbaix 
) , throughout the world, is a rare last name. The last name Derbaix is habitual in Belgium, where it is a rare surname, France, where it is a very rare surname, and Spain, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Derbaix | Belgium, United States, Spain, France |
| eugène derbaix Belgian politician, BE (b. 1855) |
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| charles derbaix Belgian politician and lawyer, BE (b. 1885) |
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