Lake Maurepas is located in southeastern Louisiana, approximately halfway between New Orleans and Baton Rouge, directly west of Lake Pontchartrain. Lake Maurepas was named for Jean-Frédéric Phélypeaux, comte de Maurepas, an eighteenth-century French statesman, and chief adviser to King Louis XVI. Jean-Frédéric was the son of Louis Phélyp…Lake Maurepas is located in southeastern Louisiana, approximately halfway between New Orleans and Baton Rouge, directly west of Lake Pontchartrain. Lake Maurepas was named for Jean-Frédéric Phélypeaux, comte de Maurepas, an eighteenth-century French statesman, and chief adviser to King Louis XVI. Jean-Frédéric was the son of Louis Phélypeaux, comte de Pontchartrain, for whom Lake Pontchartrain is named.