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Diem Family HistoryRecorded in a number of spelling forms including Diem, Thiem, Diemer, Thieme, Diemar, Diemann, Thiemann, and others, this is a German surname. It is of ancient origins from at least the 7th century a.d., and was originally a personal name. It derives from 'dietmar' meaning ' folk famous', a personal name and a later surname in its own right. Compound personal or baptismal names which extolled virtue, power, godliness and victory, were very popular at this period of history called 'The Dark Ages'.
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