Bigot means "By God"?

FortuneCookie posted...

(English, French) Nickname given to one by reason of the excessive use of the oath, by God; a hypercritical or intolerant person.

Dictionary of American Family Names (1956) by Elsdon Coles Smith

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Makes sense. If someone says their rules or justification is 'by God' all the time you're going to create a word for such a person.