Cognomen Stillis (Stillis 
) , around the globe, is a very rare family name. The cognomen Stillis is habitual in Latvia, where it is a rare surname, Lithuania, and the United States, where it is an extremely rare surname. Much less frequently, Stillis is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Stillis | Latvia, Lithuania, United States |