How many countries use the word dollar for the name of their currency?

Dollar is the name of more than 25 currencies. The United States dollar, named after the international currency known as the Spanish dollar, was established in 1792 and is the first so named that still survives. Others in use today include; the Australian dollar, Brunei dollar, Canadian dollar, Eastern Caribbean dollar, Hong Kong dollar, Jamaican dollar, Liberian dollar, Namibian dollar, New Taiwan dollar, New Zealand dollar, Singapore dollar, Trinidad and Tobago Dollar and several others. The symbol for most of those currencies is the dollar sign $ in the same way as many countries using peso currencies. The name "dollar" originates from Bohemia and a 29 g silver-coin called the Joachimsthaler.

n 15 January 1520, the Kingdom of Bohemia began minting coins from silver mined locally in Joachimsthal and marked on reverse with the Bohemian lion. The coins would be named Joachimsthaler after the town, becoming shortened in common usage to thaler or taler, which became dollar in English.