I have just found your query on the Unknown Parish Query and wanted to let you know that my mothers maiden name was Durapau. I have just started on the Durapau line and it is hard. The St. Charles Parish Census shows a number of Durapau's.
My Mother is Marjorie Durapau Dempster, her mother was Marie Nicholas Durapau(Noon)(1908-1993)married to Louis Benedict Durapau(ABT.1908-1961)and his parents were Wencelas Durapau (1882-1915) and Marie Torregrossa Durapau (1902-1925). Please if this is part of your line let me know.