Surname Билян (Bilian 
, Билян 
, Bilyan 
) , worldwide, is a rare cognomen. The family name Билян is characteristic of Bulgaria, where it is a rare surname, Armenia, and Russia. Measured by absolute frequency, this name is the most popular in Russia, Indonesia, and Bulgaria. Also, Билян is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Bilian | Bulgaria, Indonesia, United States, India, China |
| Билян | Kazakhstan, Belarus, Bulgaria, Russia, Armenia |
| Bilyan | Spain, Bulgaria, Indonesia, United States, India |