Bigamy

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Middle English: from Old French bigamie, from bigame ‘bigamous’, from late Latin bigamus, from bi- ‘twice’ + Greek -gamos ‘married’.

wiktionary

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From Middle English bigamie(“having two spouses simultaneously, bigamy; second marriage; marrying a widow or widower”)[and other forms], [1] from Anglo-Norman bigamie and Middle French bigamie(“having two spouses simultaneously; second marriage; marrying a widow or widower”) (modern French bigamie(“bigamy”)), and its etymonLate Latin bigamia(“having two spouses simultaneously; second marriage”), from Late Latin, Latin bigamus(“bigamous”) + -ia (variant of -ius(suffix forming adjectives from nouns)). [2]Bigamus is derived from bis(“twice, two times”) + Ancient Greek γάμος(gámos, “marriage; matrimony”) (from Proto-Indo-European *ǵem-(“to marry”)). The English word is analysable as bi- +‎ -gamy.

etymonline

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bigamy (n.)

"state of having two wives or husbands at the same time," mid-13c., from Old French bigamie (13c.), from Medieval Latin bigamia "bigamy," from Late Latin bigamus "twice married," a hybrid from bi- "double" (see bi-) + Greek gamos "marrying" (see gamete). The Greek word was digamia, from digamos "twice married."

Bigamie is unkinde ðing, On engleis tale, twie-wifing. [c. 1250]

In Middle English, also of two successive marriages or marrying a widow.