Zar was formerly part of the German Empire. In the German Empire, the place was called Żar.
The place is now called Żar and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Zar | Russian Empire | Petrokov | 1914 |
| Żar | Poland | Piotrków | 1921 |
| Żar | German Empire | Lask | 1939 |
| Żar | Poland | Bełchatów | 1945 |
| Żar | Poland | Piotrków | 1992 |