There was a strong pro-Nazi contingent amongst (mainly) Afrikaans-speaking South Africans. That’s not to say by any stretch that Afrikaners were mostly pro-Nazi, though. Jan Smuts was an Afrikaner and was both a Field Marshal in the South African defence forces and the prime minister during WW2 - he wasn’t exactly pro-British (he fought against them in the second Boer war), but he was very strongly anti-Nazi.