My interpretation is that in the first 2 instances Gerrit Victor and Jennis are the fathers, but in the third not (the father is clearly named).
There are a number of slave baptisms at http://www.eggsa.org/sarecords/index.php/church-registers/cape-town...
where the father's are not named - as company slaves these women were house in the Slave Lodge which was frequented by company employees and others for their pleasure - DNA may reveal the descendants of these children were the children of known men - and whether there is a record of a documented line of descent or not is dubious! There were so many slaves of similar/same names that linking baptisms to later marriages would not be straight forward!
Delia Robertson would be the person to give feedback here. The pages at TFFYP are invaluable regarding the slave children baptised - see http://www.e-family.co.za/ffy/ui106.htm
Further examples of children baptised where the slave owner is named -
18 Jul 1660
Jannetje, child of Thielman Heindricxsz, free burger
Pietertje, child of a slave woman belonging to Pieter van der Stael
Reintje, child of a slave woman belonging to the Commander
Translated from
Den 18:en d:o heeft d:o Karon wederom een predikatie gedaen, ende gedoopt dese 3 kinderen, een van Thielman Heindricxsz <vrijburger> en is genaemt Jannetje, een van mijn slavin is genaemt Pietertje, en een van de slavin van den h:r commandeur is genaemt Reintje, dese twee zijn onechte kinderen, Godt de geeft dat dese gedoopte kinderen tot zijne naeme eere mogen opwassen.
http://www.eggsa.org/sarecords/index.php/church-registers/cape-town...
on the same page - an interesting entry
8 April 1663
Louwijs, child of a slave woman
witnesses: Gabriel Joosten Cornet, and Denijs Otto, both corporals
Den 8:... ende een van een slavin gebooren, en is genaemt Louwijs, de getuigen sijn Gabriel Joosten Cornet, en Denijs Otto beide corporaels, dit kint is in onecht geboren Godt de Heere geeft dat dese gedoopte kinderen tot Sijne naeme eere mogen opwassen.
On page http://www.eggsa.org/sarecords/index.php/church-registers/cape-town...
[Sept 6 1665] - the father named
een slavinne zoon van W. Mostaart diens
naam Sabba, het kind Dirik
There are many instances where the baptism of a slave-child has witnesses who were not slaves judging by their names. It would be incorrect procedure to assume that the man was the father of the child. I will add some examples here when I come across them.
In my opinion it would be presumptuous to assume that the owner of the slave was the father of her children - they may well have been but it isn't necessarily the case.
I would value input from Private