Family name Siella (Siella 
) , across the world, is a very rare cognomen. The surname Siella is habitual in Greece, where it is a very rare surname, Indonesia, and Malaysia, where it is an extremely rare surname. Also, Siella is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Siella | Greece, South Africa, Philippines, Indonesia, Malaysia |