Gaj was formerly part of the German Empire. In the German Empire, the place was called Gaj.
The place is now called NN and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Gaj | Russian Empire | Kutno | 1914 |
| Gaj | Poland | Kutno | 1921 |
| Gaj | German Empire | Kutno | 1939 |
| Gaj | Poland | Kutno | 1945 |
| NN | Poland | Płock | 1992 |