Family name Демир-Оол (Демир-Оол 
) , all around the world, is an extremely rare last name. The last name Демир-Оол is habitual in Eastern Europe, particularly Russia, where it is an extremely rare surname. Also, Демир-Оол is the forename as well as the last name. Parts of the name also exists independently as a first name Демир, and a first name Оол.
| VARIANT | COUNTRY |
|---|---|
| Демир-Оол | Russia |