I would like to gather information regarding the Knights that emigrated to South Africa in the 1800.
Esile,
You can use this website to see where the surname Knight was found in the mid 1800s. As you can see it was scattered across the country. In the 1901 Irish census there were 1191 people named Knight, again scattered around the country. So we do need a bit more information if we are to try and help: