Lacoste (as my family name is spelled)is one of the oldest family names for les gens de couleur libre (free people of color). It is a family name found in records prior to the Louisiana Purchase. The best way to find out more about your ancestry is to look through the U.S. Census. For you, my advice is to start in Mobile, which was coincidentally the first capital of Colonial Louisiana. My ancestry can be traced with near certainty to the Lacoste Plantation, just down river from New Orleans in what is known today as St. Bernard Parish. The plantation owner, Pierre Lacoste, was a free person of color who led a battalion comprising the same under Gen. Andrew Jackson at the Battle of New Orleans in 1814-15. If you need help or assistance, feel free to respond with any questions you may have.