Dear Shawn; It would appear the name kalwerbossie is derived from kalwers as the plant was used by the Hottentots for the cure of some diseases in cattle, especially for "worms in calves" whence the vernacular name bossie being Dutch for bush, thus the name refers to the Bush used as a remedy for worms. Rabassam is a Cape Malay corruption of 'rabas' most commonly in reference to Pelargonium antidysentericum a decoction of the plant's rootstock being used by Hottentots in milk decoctions for anaemias and weakness. It was the name used by the Hottentots for this plant, and consequently extended to others by the colonists from the similarity of use. I hope this is of some help. Cheers, John E. Bryan