Jast was formerly part of the German Empire. In the German Empire, the place was called Jast-Fährenort.
The place is now called Dziećkowice-Jazd (Mysłowice-Dz.-Jazd) and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Jast | German Empire | Pleß | before the Versailles Treaty |
| Jazd | Poland | Pszczyna | after the Versailles Treaty |
| Jast-Fährenort | German Empire | Pleß | 1939 |
| Jazd | Poland | Pszczyna | 1945 |
| Dziećkowice-Jazd (Mysłowice-Dz.-Jazd) | Poland | Katowice | 1992 |