Cognomen Cilus (Cilus 
) , in the world, is a very rare last name. The surname Cilus is habitual in Brazil, where it is a very rare surname, France, where it is an extremely rare surname, and Nigeria. Not in comparison with a country's population, this name is the most popular in Brazil, Nigeria, and the United States. Much less frequently, Cilus is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Cilus | Brazil, United States, Nigeria, Peru, Philippines |