'affeir' originates from Old French, specifically the word 'afeer,' where 'a-' meant 'to' and 'feer' meant 'to make or do.'

'afeer' transformed into the Middle English word 'affeiren,' and eventually became the modern English word 'affeir.'

Initially, it meant 'to make or do something,' but over time it evolved into its current meaning of 'to belong or pertain to.'