Demarais Family History
Demarais Name Meaning
Altered form of French Desmarais a cognate of 2 below. In some cases possibly also French: habitational name with fused preposition de for someone from any of several minor places in northern France named Marais (from Old French mareis ‘marsh’) hence a variant of Marais Alternatively the name may simply have been topographic.
Source: Dictionary of American Family Names 2nd edition, 2022