Surname Vanzyak (Vanzyak 
, Ванзяк 
) , around the globe, is a rare cognomen. The surname Vanzyak is characteristic of Ukraine, where it is a rare surname, Belarus, and Kyrgyzstan, where it is a very rare surname. In absolute terms, it is the most numerous in Eastern Europe, particularly Ukraine, Belarus, and Russia.
| VARIANT | COUNTRY |
|---|---|
| Vanzyak | United States, Ukraine |
| Ванзяк | Kazakhstan, Ukraine, Belarus, Kyrgyzstan, Russia |