Last name สิลา (Sila 
, Silas , สิลา 
) , in the entire world, is a widespread cognomen. The surname สิลา is characteristic of Vanuatu, where it is a common surname, Namibia, where it is quite a common surname, and Guinea-Bissau (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in Sub-Saharan Africa, particularly Nigeria, Kenya, and Ethiopia. More frequently, สิลา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Silas, Sila | Kenya, Brazil, India, Ethiopia, Nigeria |
| สิลา | Thailand |
| Siila | Finland, India, Tanzania, South Africa |