Cognomen Rachkowski (Rachkowski 
) , worldwide, is a very rare last name. The last name Rachkowski is characteristic of Northern America, particularly Canada, where it is a very rare surname, and the United States, where it is an extremely rare surname. Very seldom, Rachkowski is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rachkowski | Canada, United States |