Cognomen Боян (Bojan 
, Boyan 
, Боян 
) , in all the world, is a common surname. The last name Боян is habitual in North Macedonia, where it is a common surname, Aland Islands, where it is quite a common surname, and Bulgaria (explore the name in all countries). Measured by absolute frequency, this name is the most popular in North Macedonia, Romania, and Bulgaria. More prevalently, Боян is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Bojan | Bosnia and Herzegovina, Croatia, Slovenia, Serbia, North Macedonia |
| Boyan | Bulgaria, Indonesia, United States, Serbia, North Macedonia |
| Боян | Bulgaria, Kazakhstan, Ukraine, Armenia, Russia |
| Boian | Germany, Bulgaria, India, United States, Romania |