Cognomen Лясс (Lyass 
, Liass 
, Лясс 
) , all over the world, is a rare family name. The surname Лясс is habitual in Algeria, where it is a rare surname, Morocco, and Kazakhstan, where it is a very rare surname. Not in comparison with a country's population, the name is most common in Algeria, Morocco, and Russia. Likewise, Лясс is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Lyass | Russia, Morocco, Algeria, Malaysia, United States |
| Liass | Algeria, Malaysia, Nigeria, United States, France |
| Лясс | Kazakhstan, Russia, Ukraine |