'leaver' originates from Old English, specifically the word 'læfan,' where 'læfan' meant 'to leave or allow to remain.'

'læfan' transformed into the Middle English word 'leven,' and eventually became the modern English word 'leave,' from which 'leaver' is derived.

Initially, it meant 'to allow to remain,' but over time it evolved into its current meaning of 'a person who leaves.'