Grumble Grumble Grumble
I should try to be more careful when making a post close to midnight local time....
In the anime series 'Nana 7 of 7' (Shichi-nin no Nana) the main character is a middle school girl who gets 6 clones of herself, each with a slightly different aspect of her personality. And each of the clones get a 'Nana' name with a varition, these are
Nanakko (sleepy nana)
Nanatchi (cheerful nana)
Nanasama (smart nana)
Nanappe (hot tempered/angry nana)
Nanarin (cry baby nana)
Nanapon (Spiritual nana)
(names as listed in the AnimeNfo database...)
So any guesses on surnames (or puns?) as I'm only seeing the obvious ones...