Globally, Cieslak (Cieslak 
) is a very rare epicene forename. The first name Cieslak is habitual in Poland, where it is a very rare female name, and China, where it is an extremely rare male name. Very seldom, Cieslak is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Cieslak | Brazil, Poland, France, United States, Germany |
| mikolaj cieslak researcher |
|