Surname ศิวิลัย (ศิวิลัย 
, Civilai 
) , in all the world, is quite a rare last name. The cognomen ศิวิลัย is habitual in South-eastern Asia, particularly Thailand, where it is quite a rare surname. Very seldom, ศิวิลัย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ศิวิลัย | Thailand |
| Civilai | Australia, Thailand, United States |