Cognomen Jencek (Jencek 
) , in all the world, is a rare last name. The surname Jencek is habitual in Czechia, where it is quite a rare surname, Austria, where it is a rare surname, and Italy, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in Czechia, Austria, and the United States. Very seldom, Jencek is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Jencek | Austria, Italy, Czechia, Poland, United States |