Family name Sejlis (Sejlis 
, Сейлис 
) , globally, is a very rare surname. The last name Sejlis is habitual in Eastern Europe, particularly Russia, where it is a very rare surname, and Ukraine, where it is an extremely rare surname. Likewise, Sejlis is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sejlis | Poland |
| Сейлис | Russia, Ukraine |