'allegiant' originates from Middle English, specifically the word 'allegiaunce,' where 'al-' meant 'to' and 'legiance' meant 'loyalty.'

'allegiaunce' transformed into the modern English word 'allegiant' through the influence of Old French 'allegeance.'

Initially, it meant 'loyalty or obligation of a subject to a sovereign,' but over time it evolved into its current meaning of 'loyal or faithful.'