When Gerhardus Harmanus Janzen was born on 9 September 1857, in Gorssel, Gelderland, Netherlands, his father, Harmanus Janzen, was 28 and his mother, Johanna van der Meij, was 26. He married Petronella Siebenheller on 7 November 1888, in Arnhem, Gelderland, Netherlands. He died on 4 November 1927, in Zutphen, Gelderland, Netherlands, at the age of 70.
Some characteristic forenames: German Bernd, Ernst, Erwin, Claus, Erna, Fritz, Heinz, Hertha, Juergen, Klaus, Kurt, Reinhild.
North German and Dutch: variant of Jantzen or Jansen .