'illegitimately-claimed' originates from the Latin word 'illegitimus,' where 'in-' meant 'not' and 'legitimus' meant 'lawful.'

'illegitimus' transformed into the Old French word 'illégitime,' and eventually became the modern English word 'illegitimate.'

Initially, it meant 'not lawful,' but over time it evolved into its current meaning of 'claimed without legal or moral justification.'