Interesting ... I had never heard of Rhineland Bastards.
mulatto
The word ‘mulatto’ is derived from the Arabic muwallad, which originally referred to persons who were not ‘genuine’ Arabs, especially individuals born of black-white ‘misalliances’. With the beginning of the transatlantic African slave trade in the fifteenth century, the word mulatto first found its way into Portuguese, and then into almost all European languages, as the term for offspring of mixed European (Caucasian) and African (Negroid) parentage. (Only Afrikaans used the word ‘Bastard’ for such persons.)