'mistakenly-changed' originates from the combination of 'mistakenly,' derived from 'mistake,' and 'changed,' derived from 'change.'

'Mistakenly' evolved from the Old Norse word 'mistaka,' meaning 'to take in error,' and 'changed' from the Old French 'changier,' meaning 'to alter.'

Initially, 'mistakenly' meant 'in error,' and 'changed' meant 'altered.' Together, they convey the idea of an alteration made in error.