Cognomen Siolla (Siolla 
, Syllaba 
) , worldwide, is a rare last name. The cognomen Siolla is habitual in Austria, where it is a rare surname, Czechia, and Canada, where it is a very rare surname. Measured by absolute frequency, it is commonest in Austria, Czechia, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Siolla | Argentina, Brazil |
| Syllaba | Czechia, Austria, United States, Canada, Brazil |