[Zeldor]

I'd rather go with name Sarmatia.

Sarmatia (Polish: Sarmacja) was the semi-legendary and poetic name of the Commonwealth, which was fashionable through the eighteenth century, designating qualities associated with the literate citizenry of the vast Polish-Lithuanian Commonwealth. The culture, lifestyle and the ideology of the Polish nobility were greatly affected by Sarmatism. It was a unique phenomenon for its cultural mixture of Eastern, Western and native traditions. The trend considerably influenced the noble cultures of other countries, such as Hungary, Moldova and the Slavic regions. Later Polish culture continued to be profoundly influenced by the Sarmatian tradition.