Family name Tretjakow (Третьяков 
, Tretjakow 
) , worldwide, is a common cognomen. The family name Tretjakow is characteristic of Belarus, where it is quite a common surname, Russia, and Kazakhstan. In absolute terms, the name is most common in Russia, Ukraine, and Kazakhstan.
| VARIANT | COUNTRY |
|---|---|
| Третьяков | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Tretjakow | Germany, Canada |
Tret'Jakov, Tretiakov, Tretjakov, and Tretyakov
| alexej tretjakow RU (b. 1965) |
|