'waker' originates from Old English, specifically the word 'wacan,' where 'wacan' meant 'to wake or become awake.'

'wacan' transformed into the Middle English word 'waken,' and eventually became the modern English word 'wake,' from which 'waker' is derived.

Initially, it meant 'to become awake,' but over time it evolved into its current meaning of 'a person or thing that wakes.'