Cognomen Mikuliak (Mikuliak 
, Микуляк 
) , in all the world, is quite a rare family name. The surname Mikuliak is habitual in Ukraine, where it is quite a rare surname, Russia, where it is a rare surname, and Kazakhstan.
| VARIANT | COUNTRY |
|---|---|
| Mikuliak | United States, Georgia, Canada |
| Микуляк | Ukraine, Russia, Kazakhstan, Belarus |