Calmus was formerly part of the German Empire. In the German Empire, the place was called Kalmus.
The place is now called Calmus and belongs to Luxembourg.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Calmus | Luxembourg | Diekirch | 1939 |
| Kalmus | German Empire | Diekirch | 1940 |
| Calmus | Luxembourg | Diekirch | 1945 |
| Calmus | Luxembourg | Diekirch | 1993 |