Polish złoty
It is common to name a unit with a unit of weight, such as pound, lira, and baht. In most cases, these currencies were originally defined as that amount of some precious metal. Another choice of name is some form of derivative of the political entity. The Afghan afghani and European euro fall into this category. Sometimes the name is simply the name of the metal of which the coins were or are made, such as Polish złoty (“golden”) and Vietnamese đồng (“copper”), or its geographical origin, e.g. Joachimsthaler (see Dollar).