Kugljaken was formerly part of the German Empire. In the German Empire, the place was called Kuglacken.
The place is now called Kudrjavcevo and belongs to Russian Federation.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Kuglacken | German Empire | Wehlau | 1939 |
| Kugljaken | Under Soviet administration | Kaliningrad | 1945 |
| Kudrjavcevo | Russian Federation | Černjahovsk | 1992 |