'Cavalier' originates from the Late Latin word 'caballarius,' meaning 'horseman' or 'knight.'

'Caballarius' transformed into the Old French word 'chevalier,' and eventually became the modern English word 'cavalier.'

Initially, it meant 'horseman' or 'knight,' but over time it evolved into its current meanings of 'supporter of King Charles I' and 'showing a lack of concern.'