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Last name origins & meanings:

1. Scottish: habitational name from Dollar in Clackmannanshire.
2. Americanized spelling of German <xref>Dahler</xref>, Daler, or Taler, topographic names for someone who lived in a valley, from Middle High German tal ‘valley’ + the suffix -er denoting an inhabitant. The American word dollar is from Czech tolar, German Thaler, denoting a silver coin first minted at the silver mines at Joachimsthal (‘Joachim’s valley’) in Bohemia (Czech name: Jáchymov).
3. Americanized spelling of Slovenian Dolar, topographic name for someone who lived in a valley, from dol ‘valley’, a derivative of Old High German tal ‘valley’.