When Jacob Larsen was born on 6 March 1808, in Oxholm, Øland, Øster Han, Hjørring, Denmark, his father, Laurs Jacobsen, was 44 and his mother, Anne Michelsdatter, was 45. He married Anne Kirstine Jensdr on 2 April 1833. They were the parents of at least 3 sons and 10 daughters. He lived in Øland, Øster Han, Hjørring, Denmark in 1834 and Holbæk, Denmark for about 10 years. He died on 1 September 1860, in Ålborg, Denmark, at the age of 52.
Some characteristic forenames: Scandinavian Erik, Lars, Nels, Niels, Sven, Thor, Knud, Nils, Per, Jorgen, Alf, Bjorn.
Danish, Norwegian, and North German: patronymic from the personal name Lars, an equivalent of Lawrence . This is also an Americanized form of the cognate Larssen. Compare Larson 1, Larrison , and Lawson 2.