Family name Марцыняк (Марцыняк 
) , worldwide, is a very rare last name. The cognomen Марцыняк is characteristic of Eastern Europe, particularly Belarus, where it is a rare surname, and Russia, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Марцыняк | Russia, Belarus |
Marcyniak, Martsyniak, and Martsynyak