Hello Ian,
The origins of the unusual surname are now clearer.
Wilhelm Johannes Njanguhl, {...} of Schlieffenberg, born in the Cordufun 1847 [i.e. Kordofan province of Sudan], date unknown, single until now
Maiden Bertha Friederike Wilhelmine Köpcke, born in Ludwigslust 6th June 1855, single until now.
The groom, a former PoW whose freedom was purchased in Egypt. Therefore the father, who was a {...}, has not been identified.
Father of the bride:
Johann Köpcke, Grand Ducal Butler (Großherzogliches Mundschenk)
On the marriage certificate of their daughter, Mathilde, who married in Dresden in 1907, Wilhelm Johannes was said to have been a manorial servant (herrschaftlicher Diener)
Justin