Cognomen Billiau (Billiau 
) , in all the world, is quite a rare family name. The surname Billiau is characteristic of Belgium, where it is quite a rare surname, Bahrain, where it is a rare surname, and France. Not in comparison with a country's population, it most frequently occurs in France, Belgium, and Australia.
| VARIANT | COUNTRY |
|---|---|
| Billiau | Germany, Belgium, Australia, United States, France |
| joseph billiau Belgian politician (1886-1960), BE (b. 1886) |
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| alfons billiau researcher |
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| kenny billiau researcher |
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| michel billiau BE |
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| johan billiau |
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