Kobyla was formerly part of the German Empire. In the German Empire, the place was called Wilhelmsthal.
The place is now called Kobyla and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Kobilla | German Empire | Ratibor | before the Versailles Treaty |
| Kobyla | Poland | Rybnik | after the Versailles Treaty |
| Wilhelmsthal | German Empire | Ratibor (mit Hultschiner Land) | 1939 |
| Kobyla | Poland | Rybnik | 1945 |
| Kobyla | Poland | Katowice | 1992 |