Last name Янек (Janek 
, Janeks 
, Yanek 
) , in the world, is quite a rare family name. The surname Янек is characteristic of Slovakia, where it is quite a common surname, Czechia, where it is quite a rare surname, and Latvia. Measured by absolute frequency, this name is the most popular in Poland, the United States, and Slovakia. More frequently, Янек is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Janek | Germany, Slovakia, Poland, United States, India |
| Janeks | Estonia, Lithuania, United Kingdom, United States, Latvia |
| Yanek | Hungary, United Kingdom, United States, India, Cuba |
| Янек | Ukraine, Kazakhstan, Belarus, Russia, Armenia |