Trhomné was formerly part of the German Empire. In the German Empire, the place was called Trahona.
The place is now called Trhomné and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Trahona | Austro-Hungary | Plan | before the Treaty of Saint-Germain |
| Trhomné | Austro-Hungary | Plan | before the Treaty of Saint-Germain |
| Trhomné | Czechoslovakia | Planá | after the Treaty of Saint-Germain |
| Trahona | Czechoslovakia | Planá | after the Treaty of Saint-Germain |
| Trahona | German Empire | Tepl | 1938 |
| Trhomné | Czechoslovakia | Plasny | 1945 |
| Trhomné | Czechoslovakia | Plzeň-sever | 1992 |
| Trhomné | Czech Republic | Plzeň-sever | 1993 |