Last name Dulniak (Dulniak 
) , globally, is a rare family name. The surname Dulniak is habitual in Poland, where it is a rare surname, the United States, where it is an extremely rare surname, and the United Kingdom. More frequently, Dulniak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Dulniak | United States, United Kingdom, Poland, Brazil |