I see what you are saying. In one marriage record they ahve his listed as Michel and in others they have him listed as Jean Baptiste. You undoubtedly noicted that many of the genrations in that family have Michel for a name. You ahve the right person and the right line> Jean Baptiste has a father Michel as in this record:
Couple# 18098 [Family]ofJEAN BAPTISTEDEROME DESCARREAUX Death : 1780-09-19 Burial : 1780-09-20 Hôpital général de Québec Father :MICHELDEROME DESCARREAUX Mother :MARIE MADELEINEDUSSAULT Couple andMARIE JOSEPHEMOREAU DESROSIERS Death : 1756-03-29 Burial : 1756-03-30 Québec Father :DANIELMOREAU DESROSIERS Mother :MARIEGROULX Couple
Marriage:1732-06-09Rivière-des-Prairies Children married before 1800 : Sex Date of marriage First name of the child Place of marriage Name of the spouse m 1763-05-30 JEAN BAPTISTE QUÉBEC[Couple]MARIE ANGELIQUEAIDE CREQUY m 1772-11-23 JOSEPH QUÉBEC[Couple]MARIE ANNEPHILIPPON PICARD m 1774-01-24 GABRIEL ST-VINCENT-DE-PAUL[Couple]MARIE ANGELIQUELORRAIN
So Gabriel's father was Jean Baptiste and his Grandfather was Michel. Now having said that many French families gave their children multiple names that were used in various records.
So, my thought is that Jean Baptiste is probaly the name to use, but it is listed as Michel in one of the church records, so it too is one of his names. Mary Frego COates