Surname Stoiu (Стою 
, Stoiu 
) , in the world, is quite a rare last name. The family name Stoiu is characteristic of Eastern Europe, particularly Bulgaria, where it is quite a common surname, Romania, where it is a rare surname, and Ukraine, where it is a very rare surname. Also, Stoiu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Стою | Kazakhstan, Russia, Bulgaria, Ukraine |
| Stoiu | Romania, United States, Spain, Canada |