Last name Sadaj (Sadaj 
, Садай 
) , throughout the world, is a rare cognomen. The family name Sadaj is habitual in Albania, where it is quite a rare surname, Azerbaijan, and Poland, where it is a rare surname. Likewise, Sadaj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sadaj | India, United States, Poland, Azerbaijan, Albania |
| Садай | Ukraine, Kazakhstan, Russia, Belarus, Kyrgyzstan |
| bolesław sadaj Polish pedagogue, PL (b. 1908) |
|
|
| ryszard sadaj PL (b. 1949) |
|