'depositor' originates from Latin, specifically the word 'depositum' (from 'deponere'), where 'de-' meant 'away' and 'ponere' meant 'to place'.

'depositor' changed from Old French 'depositeur' and Middle English forms such as 'depositeur' and eventually became the modern English word 'depositor'.

Initially, it meant 'one who puts something down or places something away', but over time it evolved into the more specialized modern meaning 'a person who places money or items with an institution or person for safekeeping'.