Last name ศิ (Si 
, ศิ 
) , in the world, is a widespread surname. The last name ศิ is habitual in Macao, where it is a common surname, Myanmar, and Malaysia, where it is quite a common surname (explore the name in all countries). Measured by absolute frequency, it is commonest in China, India, and Myanmar. Likewise, ศิ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Si | China, Morocco, India, Myanmar, Indonesia |
| ศิ | Thailand |