Maurice-Louis-Alexandre Kérouac dit Lebrice arrived in New France between 1721-1726. He settled in Kamouraska where he married Louise Bernier and had four sons. In his new home he was a merchant trader and as he was preparing to leave for France on business was taken ill suddenly and died on 6th March, 1736.
It seems Maurice-Louis Alexander was originally known as Urban-Francois, born in Brittany. While living in England and working as a royal notary he got himself into a spot of trouble which necessitated that he leave the country after being accused of robbery and attempted rape.
He changed his name once he settled in New France, taking on the name le Brice (also spelled le Bris), but keeping de Keroac/Keroack/Kervoach. Unfortunately, he never quite settled on one spelling. His son, Alexandre has the name Kirouac.
One of his descendants would be Jack Kerouac, the French Canadian, American born author who's name at birth was Jean-Louis Lebris de Kérouac but is Jean Louis Kirouac on his baptismal certificate. It seems to be a family tradition.