tonysuperc@gmail.com wrote: I doubt that parents having lost a child would 2 years later give another child the same name?
Actually, it seems to have been very much part of the Afrikaner naming tradition, which Hendrik and Maria Barnard evidently followed :
* sons named after (a) father's father, (b) mother's father, (c) father;
* daughters named after (a) mother's mother, (b) father's mother, (c) mother;
* the name of a child who died young often given to the next child of the same sex.
Dates of birth on these old documents are by no means always accurate. The documents were often completed by officials, doctors, undertakers, and others who relied on second-hand information. As registration of births didn't become compulsory until the 1890s/1900s, there were no official certificates to refer to.
The dates of birth on Familysearch are frequently hit-and-miss, because marriage records and death notices "back in the day" didn't ask for dates of birth, only ages, and the volunteers indexing the records for Familysearch simply work backwards from the dates of the marriages or deaths.
So, your father was 26 years and a month old when he married in January 1931, the record gives his age as 26, and the indexer simply subtracted 26 from 1931. And he died a few weeks before his 64th birthday, the record therefore gives his age as 63 years, and the indexer simply subtracted 63 from 1968.
The archives in Pretoria have your father's deceased estate file. The death notice ought to name his parents, and confirm whether he was born in October or November.