[3] John Cradock, the Governor of the Cape Colony (1811–1814), named the town after his father-in-law, The 1st Earl of Clanwilliam, an Anglo-Irish nobleman.

[6] The mission there used to run a school where Harold Cressy once taught whilst studying to become the first coloured man to gain a degree in Cape Town.

[7] In 1930, District Surgeon and botanist Dr Pieter Le Fras Nortier, a former Rhodes scholar,[8][9] began conducting experiments with the cultivation of the rooibos plant.

[12] The arms, designed by Cornelis Pama, were : Or, a fess wavy Azure charged with a bar wavy Argent between in chief an elephant's head caboshed the trunk surmounting the fess proper and in base a trefoil Vert; a bordure embattled Ermine.

In layman's terms : a golden shield displaying two oranges on either side of a blue wavy vertical stripe bearing four narrow white wavy lines, at the bottom of the shield three golden Clanwilliam cedar cones on a red triangle.