Trójca was formerly part of the German Empire. In the German Empire, the place was called Troitschendorf.
The place is now called Trójca and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Troitschendorf | German Empire | Görlitz | 1939 |
| Trójca | Under Polish administration | Zgorzelec | 1945 |
| Trójca | Poland | Jelenia Góra | 1992 |