'misconfirm' originates from English, specifically combining the prefix 'mis-' (from Old English) with the verb 'confirm' (from Latin via Old French), where 'mis-' meant 'wrongly' and 'confirm' meant 'to establish as true'.

'confirmare' in Latin became Old French 'confirmer', which entered Middle English as 'confirmen/confirm'; later, the productive English prefix 'mis-' was added to form the modern English word 'misconfirm'.

Initially, it meant 'to confirm wrongly', and this core meaning remains in modern usage, though the term is rare and formal/technical.