In various registers and documents the surname of Maria Elizabeth Magdalena has been spelled in several ways:
Baptism register: Germeshuys.
Marriage register: Germishuyzen but she signed M.E.M. Germishuys and one of the witnesses signed DB Germishuys.
Death registration: Germishuysen
Death notice: Germishuizen
Mutual will: Germishuizen but she signed it M.E.M. Germishuys.
In the baptism registers of her brothers Daniel Burgert Jacobus and Michiel Burgert Johannes, the surname is Germishuys.
The Cape archives index to death notices 1834-1912 is a case in point regarding the various ways this surname was spelled: 
14 Apr 1872. Dutch Reformed Church, Napier.
"Kinderen: Maria Elizabeth Magdalena
Ouders: Germeshuys, Barend Daniel Jacobus. Matthee, Franscina Johanna
Getuigen: Michiel Burgert Matthee, Maria Franscina Gildenhuys, Petrus Theunis Johannes Germeshuys, Maria Elizabeth Magdalene Matthee, Jurie Johannes Blom, Martha Hendrika Magdalena Blom".
"South Africa, Free State Dutch Reformed Church Records, 1848-1956", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q2HG-FDXZ : 4 November 2016), Hendrik Coenraad Kukkuk and Maria Elizabeth Magdalena Germishuys, 1896. [McArthur-306 : Ian McArthur - 15 Jan 2017]
Maria Elizabeth Magdalena Kukkuk died on 11 Jul 1938 Bethel, South Africa, birth name Germishuizen ; husband Hendrik Coenraad Kukkuk; 4 children 
Hendrik died in 1942 
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