Last name Орест-Яків (Орест-Яків 
) , all around the world, is an extremely rare cognomen. Much more prevalently, Орест-Яків is the forename as well as the last name. Parts of the name also exists independently as a first name Орест, and a first name Яків.
| VARIANT | COUNTRY |
|---|---|
| Орест-Яків | Ukraine |