My Great Grandfather was George Desmarais and my Granddfather was Joseph Demarais (dropped the "S") from Westford MA .He married Dorrilda Bouchard, lived in Nashua, NH and worked in the Boston Naval Shipyard as an electrician. He had four sons... Raymond Demarais (deceased) had three sons Maurice, Richard, and George. Alfred Demarais(deceased) had four sons, Paul, Richard (deceased), Donald, and Gerald (Jerry). Edward J. Demarais (deceased) fathered no children and married very late in life.,
Robert Arthur Demarais (living) had a son Dee Daniel and two daughters Debra and Dena.
Dee Daniel Demarais married Renee Joanne Duprey of Nashua, NH and had a son Nicholas Daniel Demarais and a daughter Heather Marie.
Maybe there is a connection... I'd love to know what you find.