Seikwethen was formerly part of the German Empire. In the German Empire, the place was called Ulmental.
The place is now called Zajcevo and belongs to Russian Federation.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Seikwethen | German Empire | Tilsit-Ragnit | 1938 |
| Ulmental | German Empire | Tilsit-Ragnit | 1939 |
| Zajkveten | Under Soviet administration | Kaliningrad | 1945 |
| Zajcevo | Russian Federation | Neman | 1992 |