She doesn't have one. Her official name is MEIKO. You probably saw "Sakine" somewhere, that's because of Sakine Meiko.
Sakine Meiko in an fanmade recognized by Crypton (together with Akita Neru, Yowane Haku, Tako Luka, and Hachune Miku). She's and derivation of MEIKO, representing an younger version of her. Search her on the wikia for more information