Surname Bykhun (Bykhun 
, Быхун 
) , around the globe, is a rare last name. The cognomen Bykhun is characteristic of Eastern Europe, particularly Belarus, where it is a rare surname, Russia, where it is a very rare surname, and Ukraine, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Bykhun | Russia, Ukraine |
| Быхун | Russia, United States, Belarus |