Family name Sialis (Sialis 
) , around the globe, is a rare last name. The cognomen Sialis is characteristic of Cyprus, where it is quite a rare surname, Papua New Guinea, and Greece, where it is a rare surname. Much less frequently, Sialis is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sialis | Greece, Mexico, United States, Papua New Guinea, Cyprus |