Surname Sivaia (Sivaia 
, Сивая 
) , all around the world, is a rare family name. The cognomen Sivaia is habitual in Belarus, where it is quite a rare surname, Kazakhstan, where it is a rare surname, and Russia. Very seldom, Sivaia is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sivaia | United States, India |
| Сивая | Russia, Ukraine, Kazakhstan, Belarus |