Sowieniec was formerly part of the German Empire. In the German Empire, the place was called Sowińce.
The place is now called Sowieniec and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Sowieniec | Russian Empire | Lask | 1914 |
| Sowieniec | Poland | Łask | 1921 |
| Sowińce | German Empire | Lask | 1939 |
| Sowińce | Poland | Łask | 1945 |
| Sowieniec | Poland | Sieradz | 1992 |