nanny

the term 'nanny' first appeared in english in the late 18th century as a familiar or pet name for a nurse or a female caretaker of children. it is derived from the given name 'ann' or 'nancy', which were common names for nurses and servants, through the affectionate, child-language form 'nanny'. this process, where a personal name becomes generalized for a role, is a common pattern in language evolution. the further extension of the word to mean 'grandmother' in informal use follows a similar pattern of applying familiar, affectionate names to familial roles.

the word 'nanny' is a simplex word, likely originating as a child's reduplicative nursery term. it does not break down into meaningful, separable morphemes in modern english.