Cognomen Rulek (Rulek 
) , worldwide, is a very rare family name. The last name Rulek is habitual in Croatia, where it is quite a rare surname, Germany, where it is an extremely rare surname, and the United States. Much less frequently, Rulek is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rulek | United States, Peru, Germany, Croatia |