'rightfully' originates from Old English, specifically the word 'rihtful,' where 'riht' meant 'right' and '-ful' meant 'full of.' 'Claimed' comes from Latin, specifically the word 'clamare,' meaning 'to call out.'

'rihtful' transformed into the Middle English word 'rightful,' and eventually became the modern English word 'rightfully.' 'Clamare' evolved into the Old French word 'clamer,' and eventually became the modern English word 'claim.'

Initially, 'rightfully' meant 'full of right,' and 'claim' meant 'to call out for something.' Over time, 'rightfully-claimed' evolved to mean 'deserving or entitled to something by right or law.'