I have been researching this line for many years, a considerable amount of information came from PRDH - Programme de Recherche en Demographic Historique (Research Programme in Historical Demography). The surname varied from Guay, Castonguay Guay, Castonguay dit Guay, Gastonguay Guay, Guay Castonguay and Castonguay. 7 ggf Gaston Guay born in France abt 1630 died in Quebec, Canada 1862, had a son Mathieu Castonguay Guay born 1854-1719, 5ggf Pierre Castonguay dit Guay 1709-1770, 4ggf Pierre Castonguay dit Guay 1733-1814 3ggf Pierre Gastonguay Guay 1762-1846, 2ggf Hubert Philibert Guay Castonguay 1801-1864, ggf Augustin Castonguay born 1854, gf Charles Guillaume Augustine 'Angus' Castonguay 1873-1963 and father Dolar Joseph Castonguay 1903-1952. Sorry I am not bilingual.
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