Gąsewo was formerly part of the German Empire. In the German Empire, the place was called Erlen.
The place is now called Olszamowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Gasewo | Russian Empire | Plock | 1914 |
| Olszamowo | Russian Empire | Plock | 1914 |
| Gąsewo | Poland | Płock | 1919 |
| Olszamowo | Poland | Płock | 1919 |
| Erlen | German Empire | Schröttersburg | 1939 |
| Gąsewo | Poland | Płock | 1945 |
| NN | Poland | Płock | 1945 |
| Gąsewo | Poland | Płock | 1992 |
| Olszamowo | Poland | Płock | 1992 |