History of dollar name
The name Thaler (from thal, or nowadays usually Tal, "valley", cognate with "dale" in English) came from the German coin Guldengroschen ("great guilder", being of silver but equal in value to a gold guilder), minted from the silver from a rich mine at Joachimsthal - Jáchymov (St. Joachim‘s Valley) in Bohemia (then part of the Holy Roman Empire, now part of the Czech Republic). The basis of "thaler" comes from Joachimsthaler. More www.wikipedia.org