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Globally, Guillou (Guillou
, غيو
, Гийу
) is a very rare unisex first name. The first name Guillou is characteristic of France, where it is a very rare epicene name, and Saudi Arabia, where it is a very rare girly name. Much more frequently, Guillou is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Guillou | United States, France, Democratic Republic of the Congo, Ivory Coast, Canada |
| غيو | Saudi Arabia |
| Гийу | Russia |