Johannes Jacobus Jans van der Werff
- Born: 6 Nov 1873, Dokkum Dongeradeel Friesland Netherlands
- Marriage: Maaike Tjeerds Jongsma on 16 Mar 1904 in Rotterdam Zuid Holland Netherlands
- Died: 9 Apr 1917, Utrecht Netherlands at age 43
Johannes married Maaike Tjeerds Jongsma, daughter of Tjeerd Jans Jongsma and Ankjen Freerks Postma, on 16 Mar 1904 in Rotterdam Zuid Holland Netherlands. (Maaike Tjeerds Jongsma was born on 25 Feb 1870 in Groningen Groningen Netherlands and died on 27 Feb 1944 in Utrecht Netherlands.)
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