'aillt' originates from Old Welsh, specifically the word 'allt', where 'allt' meant 'hill' or 'slope', indicating the serfs' association with working the land.

'allt' transformed into the Middle Welsh word 'aillt', and eventually became the modern English word 'aillt'.

Initially, it meant 'hill' or 'slope', but over time it evolved into its current meaning of 'serf or bondman'.