Grunajki was formerly part of the German Empire. In the German Empire, the place was called Gruneiken.
The place is now called Grunajki and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Gruneyken | German Empire | Angerapp | 1938 |
| Gruneiken | German Empire | Angerapp | 1939 |
| Grunajki | Under Polish administration | Węgorzewo | 1945 |
| Grunajki | Poland | Suwałki | 1992 |