Surname Boudiak (Будяк 
, Boudiak 
) , around the world, is quite a rare cognomen. The last name Boudiak is characteristic of Ukraine, where it is quite a rare surname, Kazakhstan, where it is a rare surname, and Russia.
| VARIANT | COUNTRY |
|---|---|
| Будяк | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Boudiak | France |