Johanniskrug was formerly part of the German Empire. In the German Empire, the place was called Johanniskrug (Gotenhafen-Johanniskrug).
The place is now called Święty Jan (Gdynia-Święty Jan) and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Johanniskrug | German Empire | Neustadt i. Westpr. | before the Versailles Treaty |
| Święty Jan | Poland | Wejherowo | after the Versailles Treaty |
| Johanniskrug (Gotenhafen-Johanniskrug) | German Empire | Gotenhafen/Gdingen (St.Kr.) | 1939 |
| NN | Poland | Gdynia m. | 1945 |
| Święty Jan (Gdynia-Święty Jan) | Poland | Gdańsk | 1992 |