Łachany, Fw. was formerly part of the German Empire. In the German Empire, the place was called Lachany.
The place is now called Łachany and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Lachany, Fw. | Russian Empire | Pultusk | 1914 |
| Łachany, Fw. | Poland | Pułtusk | 1919 |
| Lachany | German Empire | Ostenburg | 1939 |
| NN | Poland | Pułtusk | 1945 |
| Łachany | Poland | Ciechanów | 1992 |