Cognomen Диар (Diar 
, Диар 
) , in all the world, is quite a rare surname. The cognomen Диар is habitual in Algeria, where it is quite a rare surname, Iraq, and Indonesia, where it is a rare surname. More frequently, Диар is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Diar | Sudan, Indonesia, Iraq, Algeria, India |
| Диар | Kazakhstan, Russia |