Surname Байдек (Baidek 
, Байдек 
, Baydek 
) , in all the world, is a rare cognomen. The surname Байдек is habitual in Portugal, where it is a rare surname, Kazakhstan, and Morocco, where it is a very rare surname. Measured by absolute frequency, the name is most common in Brazil, Russia, and Kazakhstan. Much less frequently, Байдек is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Baidek | Brazil, Germany, India, Portugal, Morocco |
| Байдек | Kyrgyzstan, Russia, Ukraine, Kazakhstan |
| Baydek | Brazil, United States |