When Gunnar Christoffersen was born on 18 March 1921, in Aggersborg, Øster Han, Hjørring, Denmark, his father, Lars Peter Christoffersen, was 23 and his mother, Karen Kirstine Geertsen, was 25. He lived in Thisted, Denmark in 1930. He died on 5 April 1999, in Løgstør, Nordjylland, Denmark, at the age of 78.
Some characteristic forenames: Scandinavian Erik, Bendt, Ejnar, Holger, Iver, Lars, Morten.
Danish and Norwegian: patronymic from the personal name Christoffer (see Christopher ). In North America, this surname is also an altered form of the most common Norwegian (and also Danish) form Kristoffersen. Compare Christophersen .