In the world, Cillis (Cillis 
) is a very rare principally boy's, but very infrequently feminine first name. The forename Cillis is habitual in Southern Europe, particularly Italy, where it is a very rare male name. Predominantly, Cillis is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Cillis | Belgium, Canada, Italy, United States, Argentina |