'nana' originates from the English language, specifically as a diminutive form of 'nanny,' where 'nanny' meant 'a child's nurse or caregiver.'

'nanny' transformed into the affectionate term 'nana' and eventually became a common term for 'grandmother' in modern English.

Initially, it meant 'a child's nurse or caregiver,' but over time it evolved into its current meaning of 'grandmother.'