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Surname Billau (Billau
) , throughout the world, is a rare family name. The cognomen Billau is characteristic of Western Europe, particularly France, where it is a rare surname, Germany, and Switzerland. Not in comparison with a country's population, it is commonest in France, Germany, and the United States. Much less frequently, Billau is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Billau | Tanzania, France, United States, United Kingdom, Germany |