'everyone' originates from Middle English, specifically the words 'everi' and 'on', where 'everi' meant 'each' and 'on' meant 'one'.

'everi' and 'on' combined to form the Middle English word 'everichon', which eventually became the modern English word 'everyone'.

Initially, it meant 'each one', but over time it evolved into its current meaning of 'all people'.