Lažanek was formerly part of the German Empire. In the German Empire, the place was called Lažánky.
The place is now called Lažánky and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Lažanek | Austro-Hungary | Blatna | before the Treaty of Saint-Germain |
| Lažánky | Austro-Hungary | Blatna | before the Treaty of Saint-Germain |
| Lažánky | Czechoslovakia | Blatná | after the Treaty of Saint-Germain |
| Klein-Laschan | German Empire | Blatna | 1939 |
| Lažánky | German Empire | Blatna | 1939 |
| Lažánky | Czechoslovakia | Blatná | 1945 |
| Lažánky | Czechoslovakia | Strakonice | 1992 |
| Lažánky | Czech Republic | Strakonice | 1993 |