Family name Ілля-Олег (Ілля-Олег 
) , across the world, is an extremely rare last name. Much more frequently, Ілля-Олег is the forename as well as the last name. Parts of the name also exists independently as a first name Ілля, and a first name Олег.
| VARIANT | COUNTRY |
|---|---|
| Ілля-Олег | Ukraine |