'pocketbook' originates from the combination of 'pocket' and 'book', where 'pocket' meant 'a small bag or pouch' and 'book' referred to 'a collection of written or printed sheets'.

'pocketbook' changed from the Old English word 'pocca' (meaning 'bag') and 'bōc' (meaning 'book') and eventually became the modern English word 'pocketbook'.

Initially, it meant 'a small book that fits in a pocket', but over time it evolved to also mean 'a woman's handbag' and 'financial resources'.