1590s, from Fr. bigot (12c.), in O.Fr. "sanctimonious;" 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 French use of the word (12c.) is as the name of a people apparently in southern Gaul (which led to the now-doubtful, on phonetic grounds, theory that the word comes from Visigoth). Sp. bigote "mustache" also has been proposed as a source, though the sense is not adequately explained. The earliest English sense is of "religious hypocrite," especially a female one, and may have been influenced by beguine. Sense extended 1680s to other than religious opinions.