Cognomen Siiva (Sivert 
, Siiva 
) , globally, is a rare surname. The last name Siiva is habitual in Denmark, where it is a rare surname, Sweden, and France. Not in comparison with a country's population, it is commonest in the United States, France, and Brazil. Also, Siiva is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sivert | Sweden, Norway, United States, France, Brazil |
| Siiva | Malaysia, United States, India, Brazil, New Zealand |