Family name Демиан (Demian 
, Демиан 
, Demián 
) , in the world, is a common surname. The last name Демиан is characteristic of Moldova, where it is quite a common surname, Romania, and Lebanon. In absolute terms, it is commonest in Romania, Egypt, and Nigeria. Likewise, Демиан is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Demian | Romania, Egypt, Lebanon, Nigeria, Argentina |
| Демиан | Russia |
| Demián | Uruguay, Mexico, Chile, United States, Argentina |