The word "娜娜" is formed through the morphological process of **reduplication**, where the single character "娜" (nà), which is often used in feminine names and conveys a sense of elegance and gracefulness, is repeated to create an affectionate, informal given name. This reduplicated form is common in Chinese for creating diminutive or intimate forms of names, resulting in a name that sounds melodic, endearing, and slightly informal, much like "Anna" or "Nana" in English. The repetition itself does not change the core meaning but adds a layer of familiarity and gentle emphasis.