Thomascheinen was formerly part of the German Empire. In the German Empire, the place was called Thomascheinen.
The place is now called Tomaszyn and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Thomascheinen | German Empire | Osterode i. Ostpr. | 1939 |
| Tomaszyn | Under Polish administration | Ostróda | 1945 |
| Tomaszyn | Poland | Olsztyn | 1992 |