Cognomen Ciaus (Ciaus 
) , in the world, is a rare surname. The surname Ciaus is characteristic of Romania, where it is a rare surname, Italy, where it is a very rare surname, and Germany, where it is an extremely rare surname. Much less frequently, Ciaus is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ciaus | Philippines, Italy, United States, Romania, Germany |