Sumowo was formerly part of the German Empire. In the German Empire, the place was called Summau.
The place is now called Sumowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Summowen | German Empire | Goldap | 1938 |
| Summau | German Empire | Goldap | 1939 |
| Sumowo | Under Polish administration | Gołdap | 1945 |
| Sumowo | Poland | Suwałki | 1992 |