There is a name of a tree which is purely polish, i.e. spruce, sonding 100% Polish and meaning literally coming form Prussia.
This is what about the word origin says etymology:
Spruce: lit. "from Prussia," from Spruce, Sprws (late 14c.). Spruce seems to have been a generic term for commodities brought to England by Hanseatic merchants (beer, board, leather, and the tree was believed to have come from Prussia.
Also in Norman Davies's book God's playground: a history of Poland
The name of the spruce tree is supposed to derive from the Polish words z Prus 'from Prussia'