'moonlight' originates from the English word 'moon' and 'light', where 'moon' referred to the celestial body and 'light' referred to illumination.

'moonlight' changed from the Old English word 'mōna' and 'leoht' and eventually became the modern English word 'moonlight'.

Initially, it meant 'light from the moon', but over time it evolved into its current meaning of 'working a second job'.