First found in Gascogne, where the family was seated in ancient times.

Approximately 110 years after the first landings by Cartier, there were only about 300 people in Quebec. France gave land incentives for 2,000 migrants during the next decade. Early marriage was desperately encouraged amongst the immigrants. The fur trade attracted migrants, both noble and commoner. 15,000 explorers left Montreal in the late 17th and 18th centuries. By 1675, there were 7000 French in Quebec. Migration to New France (Quebec) continued from France until it fell in 1759. In the year 1675 the Acadian presence in Nova Scotia, New Brunswick and Prince Edward Island had reached 500. In 1755, 10,000 French Acadians refused to take an oath of allegiance to England and were deported to Louisiana. The French founded Lower Canada, thus becoming one of the two great founding nations of Canada. The distinguished family name Lacasse has made significant contributions to the culture, arts, sciences and religion of France and New France. Amongst the settlers in North America with this distinguished name Lacasse were W. Casse, who arrived in Bermuda in 1635 at the age of 19; Antoine Lacasse-Casse, who settled in Quebec in 1665; Valentin Casser, who settled in Philadelphia in 1748.

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