First given name from birth search of son on New Zealand BDM website in October 2018:
1883/6626. Knauf, Christopher John George. Mother: Jane. Father: Herman

Full given names, year and country of death, from death search on New Zealand BDM website in June 2020:
1932/9659. Knauf, Johanne Mary Frederica, died age 80Y [Therefore born circa 1852]

Full date of death of 23 July 1932 from further searching in June 2020 on BDM Search by incrementally changing the date range for the death.

Maiden name, date of birth, found in June 2020 from:
https://www.geni.com/people/Johanna-Knauf/6000000008708606419

Children found born in New Zealand from birth search on NZ BDM website in June 2020:
1881/16363. Knauf, Gertrude Martha. Mother: Johanne. Father: Herman
1883/6626. Knauf, Christopher John George. Mother: Jane. Father: Herman [Married Mary Ann Oliver]
1885/5940. Knauf, Charlotte Catherine. Mother: Jane. Father: Herman
1888/6700. Knauf, William Godfrey Frederick. Mother: Johanna. Father: Hermann
1892/5817. Knauf, Herbert Hans. Mother: Johanna. Father: Hermann