Family name Marciniak-Bielak (Marciniak-Bielak 
) , throughout the world, is an extremely rare surname. Predominantly, Marciniak-Bielak is the forename as well as the last name. Parts of the name also exists independently as a first name Marciniak, and a first name Bielak.
| VARIANT | COUNTRY |
|---|---|
| Marciniak-Bielak | Poland |