'astonisher' originates from the verb 'astonish', which comes from Old French 'estoner', from Latin 'extonare', where 'ex-' meant 'out' and 'tonare' meant 'to thunder'.

'astonish' changed from the Old French word 'estoner' and eventually became the modern English word 'astonish', from which 'astonisher' and its plural 'astonishers' are derived.

Initially, it meant 'to strike with thunder', but over time it evolved into its current meaning of 'to surprise greatly'.