Surname Иляссов (Иляссов 
, Iljassov 
, Iliassov 
) , all around the world, is a very rare family name. The surname Иляссов is characteristic of Estonia, where it is a rare surname, Russia, where it is a very rare surname, and France. Measured by absolute frequency, it is the most numerous in Russia, France, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Иляссов | Russia |
| Iljassov | Estonia |
| Iliassov | France, Canada, United States |