1598, from M.Fr.
bigot, from O.Fr., supposedly a derogatory name for Normans, the old theory (not universally accepted) being that it springs from their frequent use of O.E. oath
bi God. Plausible, since the Eng. were known as
goddamns in Joan of Arc's France, and during World War I Americans serving in France were said to be known as
les sommobiches (see also
son of a bitch). But the earliest Fr. use of the word (12c.) is as the name of a people apparently in southern Gaul. The earliest Eng. sense is of "religious hypocrite," especially a female one, and may be influenced by
beguine. Sense extended 1687 to other than religious opinions.