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French word chaque comes from Latin *casquunum, and later Old French chascun (Each; every Each one; every one.)
*casquunum (Latin)
*cascunum (Vulgar Latin)
chascun (Old French)
Each; every Each one; every one.
un (Middle French)
(cardinal) one A, an.
chasque (Middle French)
Each.
chaque (French)
Each. Every.