Cognomen Silb (Silb 
, Syllaba 
) , worldwide, is a rare family name. The last name Silb is characteristic of Austria, where it is a rare surname, Czechia, and Canada, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Austria, Czechia, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Silb | Brazil, United States |
| Syllaba | Canada, Brazil, Czechia, Austria, United States |