'aefauld' originates from Scots, specifically the word 'aefauld', where 'ae' meant 'one' and 'fauld' meant 'fold'.

'aefauld' has remained largely unchanged from its Scots origins, retaining its meaning and form in modern English.

Initially, it meant 'one-fold' or 'simple', but over time it evolved into its current meaning of 'sincere' or 'faithful'.