Surname Krewniak (Krewniak 
) , all over the world, is a very rare cognomen. The surname Krewniak is habitual in Poland, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. More prevalently, Krewniak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Krewniak | Poland, Malaysia |