ナナ ナナ(エルフェンリート)
Nana, also known as Number 7, is a young Silpelit girl who has the physical appearance of being 12–14 years old.

(excerpt from "Elfen Lied - Wikipedia":http://en.wikipedia.org/wiki/List_of_Elfen_Lied_characters#Nana)
nana (elfen lied)