Around the globe, Sienczak (Sienczak 
) is a very rare boy's forename. The first name Sienczak is characteristic of Eastern Europe, particularly Poland, where it is a very rare boy's name. Very seldom, Sienczak is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Sienczak | Germany, United Kingdom, Spain, United States, Poland |
| lara sienczak DE (b. 1993) |
|