Hejlov was formerly part of the German Empire. In the German Empire, the place was called Hejlow.
The place is now called NN and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Hejlow | Austro-Hungary | Starkenbach | before the Treaty of Saint-Germain |
| Hejlov | Austro-Hungary | Starkenbach | before the Treaty of Saint-Germain |
| Hejlov | Czechoslovakia | Jilemnice | after the Treaty of Saint-Germain |
| Hejlow | German Empire | Hohenelbe | 1938 |
| Hejlov | Czechoslovakia | Jilemnice | 1945 |
| Hejlov | Czechoslovakia | Semily | 1992 |
| NN | Czech Republic | Semily | 1993 |