'justly-assigned' originates from the English words 'justly' and 'assigned', where 'justly' means 'in a fair or rightful manner' and 'assigned' means 'allocated or designated'.

'justly' and 'assigned' have been used in English since the Middle Ages, with 'justly' deriving from the Old French 'juste' and 'assigned' from the Latin 'assignare'.

Initially, 'justly' meant 'in accordance with justice', and 'assigned' meant 'to mark out or designate'. Over time, they combined to form the modern meaning of 'fairly allocated'.