I've never known or known about an Afrikaans person with the name "Bron". It is a word, and it does mean "source", like the source of a river as well as figuratively, but I'd like to see a reference.
Bronson is sometimes used as a male name in South Africa. But, once again, never by an Afrikaans person as far as I know.
Many of you will laugh at this, but I find this name to be masculine in sound. I think it only works in the culture it comes from, as people from the US and Canada, for instance, would surely think it's masculine, short for Bronson or something.