When Johannes Anthonius Derksen was born on 9 July 1886, in Renkum, Gelderland, Netherlands, his father, Hendrikus Derksen, was 42 and his mother, Hendrina Janssen, was 33. He married Lily Müller on 10 September 1919, in Salatiga, Central Java, Indonesia. They were the parents of at least 3 sons and 1 daughter. He died on 25 April 1945, at the age of 58, and was buried in Cimahi, West Java, Indonesia.
Some characteristic forenames: German Johannes, Reinhard, Ulrike.
Dutch (mainly East Netherlands) and North German: variant of Derks .