After researching in Dutch birth/marriage archives in Amsterdam I found out that my forefather Jaques du Bois came from Elbing / Elblag. He was married to Johanna Sophia Wilson.
He had at least one son named Charles Henri du Bois. He was born around 1780 in Elbing and moved to Amsterdam around 1800.
This summer I am planning a trip to Elblag, but If anymore has more information about this family, please let me know.