Origin: Japanese, Greek, Georgian, English
七 (Japanese) "Seven"
菜 奈 (Japanese) "Vegetables, greens"
Meaning: a Japanese feminine name with a variety of meanings depending on the kanji used. It could mean "vegetables, greens" from na 菜 with the phonetic character of na 奈 , but it also means "seven" as well.
It's also a Greek name, a diminutive of Ioanna, the Greek form of Joanna, the feminine form of John meaning "Yahweh is gracious".
It's also a Georgian feminine name of unknown mean, with Nanuli being the diminutive form of it.
Nana is also a word in English, referring either to a grandmother or a nursemaid/nanny.
In Greek mythology, Nana is the name of a naiad-nymph who inhabited a river in Phrygia (central Anatolia). She was impregnated by an almond that fell in her lap, grown from a tree that had sprung up from the castrated genitals of the hermaphroditic deity Agdistis (who later became Cybele after the castration) and give birth to a son, Attis. This Nana's name is most likely Phrygian in origin though I couldn't find the etymology behind the name.