Cognomen Dadaj (Dadaj 
) , in the world, is a rare family name. The cognomen Dadaj is habitual in Slovakia, where it is quite a rare surname, Albania, and the United States, where it is an extremely rare surname. Much less frequently, Dadaj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Dadaj | India, United States, Slovakia, Albania |