And the word thaler is a shortened version of Joachimsthaler. Joachimsthal was the place where the silver for the coins was mined. And the second part of that, thal, is cognate with English dale.
Very interesting! Dale is anachronistic in English by now I guess. I've only read it literarily as in "over hill and dale" and otherwise thought of Tal as valley in German.
It's certainly not anachronistic in England in place names, nor as a name for a type of (water- or glacier-carved) landform.
Ha. I thought that "taler" is a wordplay for "teller" (like a bank teller).