Surname Silliam (Silliam 
) , around the globe, is an extremely rare last name. The family name Silliam is habitual in Latin America and the Caribbean, particularly Chile, where it is an extremely rare surname. More prevalently, Silliam is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Silliam | India, United States, Costa Rica, Chile, Brazil |