Haźlach was formerly part of the German Empire. In the German Empire, the place was called Haslach.
The place is now called Haźlach and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Haslach | Austro-Hungary | Teschen/Cieszyn,Český Těšín | before the Treaty of Saint-Germain |
| Hazlach | Austro-Hungary | Teschen/Cieszyn,Český Těšín | before the Treaty of Saint-Germain |
| Haźlach | Poland | Cieszyn | after the Treaty of Saint-Germain |
| Haslach | German Empire | Teschen | 1939 |
| Haźlach | Poland | Cieszyn | 1945 |
| Haźlach | Poland | Bielsko | 1992 |