This surname comes from an old family (de Didilmissen) that lived near the modern towns of "Dielmissen" and "Bodenwerder" in modern Lower Saxony (Niedersachsen).
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Julius Friedrich Max Diermissen (*07.01.1870 Hamburg- ✝ 28.03.1927 San José, Costa Rica, German vice-consul in Puntarenas, Costa Rica, from 1894-1902, and U.S. consular agent in the same port from 1894-1901.