Globally, Garreau (Garreau 
) is a very rare gender-neutral given name. The forename Garreau is characteristic of Western Europe, particularly France, where it is a very rare unisex name. Much more frequently, Garreau is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Garreau | Germany, Portugal, United States, Canada, France |