The Mystery of Banking by Murray N. Rothbard (pg. 9)

The “dollar” originated as the name generally applied to a one-ounce silver coin minted by a Bohemian count named Schlick, in the sixteenth century. Count Schlick lived in Joachimsthal (Joachim’s Valley). His coins, which enjoyed a great reputation for uniformity and fineness, were called Joachimsthalers and finally, just thalers. The word dollar emerged from the pronunciation of thaler.