Trojany was formerly part of the German Empire. In the German Empire, the place was called Trojern.
The place is now called Trojany and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Trojern | Austro-Hungary | Kaplitz | before the Treaty of Saint-Germain |
| Trojanov | Austro-Hungary | Kaplitz | before the Treaty of Saint-Germain |
| Trojany | Czechoslovakia | Kaplice | after the Treaty of Saint-Germain |
| Trojern | Czechoslovakia | Kaplice | after the Treaty of Saint-Germain |
| Trojern | German Empire | Kaplitz | 1938 |
| Trojany | Czechoslovakia | Kaplice | 1945 |
| Trojany | Czechoslovakia | Český Krumlov | 1992 |
| Trojany | Czech Republic | Český Krumlov | 1993 |