In Afrikaans “a” is mostly written as 'n while “one” is written as “een”. Afrikaans comes from Dutch and in Dutch “a” could be both 'n and “een”, while “one” is mostly written as “één” to help with pronunciation. In Afrikaans they dropped the ´.

https://translate.google.com/?sl=en&tl=af&text=a boy and a girl. one boy and one girl&op=translate