I have recently found (with the aid of Dwayne Montz, a helpful reader of these forums) baptismal records from New Orleans, Louisiana for the children of Jean Mercier a native of St. Surin, Bordeaux, France & Josephine Aubin a native of Cap François, St. Dominque. Josephine's surname is also variously spelled as Oben, Oubein & Robin [and once listed as Nantais] on her children's certificates. The children were born 1814-1822. Josephine must have been born sometime in around 1790-1800. Josephine's son, Jean Dominique Mercier, is listed in the US census as a free person of color, thus I assume that Josephine was probably also a free person of color, although she may have been a slave on St. Domingue. It is more likely that she was a refugee from the revolution that was happening on St. Domingue in the 1790s.
I would love to have more information about her family and her origens.
It is possible that Josephine's mother may have been Marie Magdre duChance, since she is listed as"grandmother" on Dominique's baptismal certificate.
Other baptismal sponsors for Josephine's children were also natives of St. Domingue and their names were: Jacques Aja[a?]ud, Marie Virginie Tasbon, Thomas Touche[t?], Elisabeth Le[c?]am, Julien Dunjon, Marie Cabaville, Dyonisis Leon.