Where does “chaston” come from?

chaston (Middle French) comes from Old French chastun, from Frankish kastō, from Proto-Germanic kastô — vessel”, “container.

Ancestry of “chaston”, step by step

StepLanguageWordMeaning
1Old Frenchchastunthe projecting part of a ring embedded with a...
2Frankishkastōbox, case; box”, “case; chest, reservoir
3Proto-Germanickastôvessel”, “container
Every word from Proto-Germanic kastô →Every word from Frankish kastō →Every word from Old French chastun →