Look at baptism and marriage documents at Simondium all in French.
People also forget how many dialects of Dutch exist even today.
Also the various other languages and dialects in Europe today and even more so in 16th and 17th century.
Look at Frisian speakers fighting for their language in Netherlands today.
Official 17th century Dutch was a unifying force and forced upon the community at the Cape but still Afrikaans developed as Dutch was a foreign language for most.
Even in Netherlands today , Dutch used is very very different from 17th century Dutch .
Cadeau did not exist it was just a persentje