Wilhelm Kevelmann was born on 11 January 1828 in Diersford, a village in Germany, located between Xanten and Wesel. His parents are Gerhard Kevelmann and Mechtilde Gräff.
At the age of 27, on 7 December 1855 in Kralingen (now part of Rotterdam), Wilhelm married 31-year-old Clara Catharina Elisabeth van Beuzekom. She was born on 12 March 1824 in The Hague as daughter of carpenter Adrianus van Beuzekom. At that time, Wilhelm lived in Puttershoek and worked as a baker. On 15 April 1856 in Puttershoek Clara gave birth to a stillborn son.
In the 1880s Wilhelm Kevelmann was living in Zwijndrecht, The Netherlands. Wilhelm was naturalised as a Dutch citizen on 11 August 1892.
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| Nederlandsche Staatscourant, 3 September 1892: Naturalisation of Wilhelm Kevelmann |
