The Genealogical Society of South Africa: eGSSA branch, ‘Birth, Marriage and Burial Registers: Baptismal Registers’' (http://www.eggsa.org/bdms/Baptisms.html : accessed DD MM 2016), Search > Surname: Marsev > Role: Mother, Entry “1744 Jan 19 Hendrik”; citing Nederduits Gereformeerde Gemeente (NGK), Tulbagh, Baptism register, 1743 to 2 Feb 1800, page 02, entry number 2. Repository: NG Kerkargief, Noordwal-Wes, Stellenbosch, G4 7/1. Transcribed by Lynn Couperthwaite, Trysie Joubert, Richard Ball as part of the eGGSA Project, from VC 657, Cape Archives Repository. Seen and entered by Dirk le Roux on Jul 29, 2016.
"Family Search.Parish registers for the Dutch Reformed Church at Tulbagh, Cape Province, 1743-1972 (https://familysearch.org/ark:/61903/3:1:3Q9M-CSV8-WTTF?i=185&cat=993682) Parish registers for the Dutch Reformed Church at Tulbagh, Cape Province Items 3 - 5 Baptisms 1743-1815. Seen and entered by Ronel Olivier July 11, 2017.
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DNA Connections
It may be possible to confirm family relationships with Hendrik by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Hendrik:
I believe the LNAB is "le Roex" based on the Baptism image. The first Baptism transcription is correct in my opinion but not the second one upon which the LNAB is based.