Surname Думаньян (Dumanian 
, Думаньян 
, Doumanian 
) , in all the world, is a rare cognomen. The surname Думаньян is habitual in Western Asia, particularly Lebanon, where it is quite a rare surname, Georgia, and Israel, where it is a rare surname. Measured by absolute frequency, it is commonest in Lebanon, the United States, and Georgia.
| VARIANT | COUNTRY |
|---|---|
| Dumanian | Israel, Argentina, Georgia, Canada, United States |
| Думаньян | Russia |
| Doumanian | Argentina, France, Canada, United States, Lebanon |