Throughout the world, Сиаваш (Siavash 
, Syavash 
, Сиаваш 
) is quite a rare boy's forename. The first name Сиаваш is habitual in Iran, where it is quite a rare boy's name, United Arab Emirates, where it is a rare masculine name, and Sweden. Not in comparison with a country's population, it is commonest in Iran, the United States, and United Arab Emirates. Very seldom, Сиаваш is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Siavash | Iran, Azerbaijan, Sweden, United States, Canada |
| Syavash | Iran, Spain, United States, France, Canada |
| Сиаваш | Ukraine, Russia |
| Siavach | Thailand |