'calm-eyed' originates from the combination of 'calm,' meaning 'peaceful,' and 'eye,' referring to the organ of sight.

'Calm' comes from the Old French word 'calme,' which was derived from the Latin 'cauma,' meaning 'heat of the day' (in the sense of 'resting during the heat of the day'). 'Eye' comes from the Old English 'ēage,' which has remained largely unchanged in meaning.

Initially, 'calm' referred to a state of rest during the heat of the day, but it evolved to mean 'peaceful' or 'serene.' 'Eye' has consistently referred to the organ of sight.