Niewiadom Dolny was formerly part of the German Empire. In the German Empire, the place was called Nieder Birkenau.
The place is now called NN and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Nieder-Niewiadom | German Empire | Rybnik | before the Versailles Treaty |
| Niewiadom Dolny | Poland | Rybnik | after the Versailles Treaty |
| Nieder Birkenau | German Empire | Rybnik | 1939 |
| Niewiadom Dolny | Poland | Rybnik | 1945 |
| NN | Poland | Katowice | 1992 |