'chubby' originates from the English word 'chub', a type of fish, where 'chub' meant 'a plump fish'.

'chub' changed from the Old English word 'ceaf', and eventually became the modern English word 'chubby'.

Initially, it meant 'plump like a chub fish', but over time it evolved into its current meaning of 'having a plump, rounded body or shape'.