Johann Friedrich Jahnsen was born about 1739, in Elze, Hildesheim, Lower Saxony, Germany. He married Anna Elizabeth Baxmann about 1756, in Elze, Hildesheim, Lower Saxony, Germany. They were the parents of at least 1 daughter. He died on 4 November 1799, in Hildesheim, Hildesheim, Lower Saxony, Germany, at the age of 61.
Some characteristic forenames: Scandinavian Erik, Niels, Johan, Knut, Per, Alf, Anders, Bjorg, Carsten, Kerstin, Lars, Ove.
Norwegian, Danish, and North German: patronymic from the personal name John, a vernacular form of Johannes (see John ). Compare Johnson .
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