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The last name Keller has Germanic origins, primarily derived from the Middle High German word "keller," meaning "cellar" or "celler," which referred to someone who worked in or owned a cellar, often associated with wine production or storage. This surname is prevalent in Germany and Switzerland, where it first appeared in the medieval period, reflecting the importance of wine and food storage in these regions. The name is indicative of the occupation of those who initially bore it, suggesting a connection to agriculture or trade. Variations of the surname can be found in different countries and languages, including "Keller" in German-speaking areas, "Keller" in French-speaking regions, and "Keller" in English-speaking countries, where it may also be used as a given name. The spelling and pronunciation remain largely consistent across these variations, although regional accents may influence how it is articulated. Overall, the surname Keller encapsulates a rich historical and occupational heritage tied to the agrarian practices of early European societies.