Throughout the world, Ондрей (Ondrej 
, Ondrey 
, Ондрей 
) is quite a common boy's first name. The first name Ондрей is habitual in Slovakia, where it is quite a common boy's name, Czechia, and Qatar, where it is a rare masculine name. Measured by absolute frequency, it is commonest in Czechia, Slovakia, and the United Kingdom. Much less frequently, Ондрей is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Ondrej | Czechia, Slovakia, Serbia, United Kingdom, United States |
| Ondrey | Germany, United Kingdom, United States, Austria, Brazil |
| Ондрей | Russia, Ukraine |
| Ondrei | Brazil, China, United States |
Ander, Anders, Andor, Andras, Andre, Andrea, Andreas, Andrei, Andrej, Andrejs, Andres, Andreu, Andrew, Andrey, Andreï, Andri, Andriej, Andriejus, Andrii, Andrij, Andrius, Andriy, Androw, Andrzej, András, Andráš, André, Andréas, Andréi, Andrés, Andřej, Antti, Dreits, Drejc, Endrū, Ondřej, Ανδρέας, Андер, Андерс, Анджей, Анджэй, Андор, Андрай, Андраш, Андре, Андреа, Андреас, Андрей, Андрейс, Андрес,