Cognomen Koloian (Колоян 
, Koloian 
) , worldwide, is a rare last name. The cognomen Koloian is habitual in Russia, where it is a very rare surname, Georgia, and Ukraine. Measured by absolute frequency, it most frequently occurs in Russia, the United States, and Ukraine. Likewise, Koloian is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Колоян | Russia, Ukraine, Armenia |
| Koloian | Russia, United States, Argentina, Georgia |